Kevin Levin (Classic)

Kevin Ethan Levin, AKA Kevin 11 AKA Kevin E. Levin, is a human/Osmosian hybrid with the ability to absorb any type of energy or matter and release it at will. He first appeared in the original series and quickly became one of Ben's most notable nemeses. However, he reformed in Ben 10: Alien Force, and then became one of the main hero characters. But in The Forge of Creation he is forced to absorb the Ultimatrix's power in order to stop Aggregor and becomes insane yet again. With the help of Cooper and Darkstar, Ben and the team manage to reverse his mutation, thus bringing him back to sanity in Absolute Power Part 2.

Personality
When Kevin was eleven years old, he was a criminally insane psychopath, willing to hurt/kill anyone for his own personal gain and/or pleasure. This behavior and mentality stems not only from having been seen and treated as a freak by his peers and family, but also because of the side-effect Osmosians have with absorbing raw energy. His sociopathy and selfishness is made apparent when he was once willing to derail a train in the subway and kill countless passengers, only to cash in on the spoils afterward. As the series progressed, more of Kevin's personality was revealed. It would seem that Kevin had an extremely negative outlook on life because of the countless hardships and struggles he had to endure, feeling insecure about himself as well as having incredibly low self-esteem. He had a deep rooted hatred for other people and society in general; Ben once rebuked him about involving innocent people in his dangerous plans, to which he bluntly replied that "Nobody's innocent! They just haven't have the chance to make fun of me yet!" further emphasizing the negative impact society had on him. In a technical light, Kevin was just as much a victim as any other.

This all changed when he met Kwarrel, a fellow prisoner in the Null Void when Kevin was a con there. Kwarrel was possibly the first and only person other than Gwen to have been genuinely sympathetic and caring towards Kevin, becoming somewhat of a father figure to him which greatly improved his personality.

In Alien Force, 5 years after the original series, a sixteen year old Kevin is seen. Despite being a con artist and an arms broker, he was noticeably more stable than his younger days; owing to his time with Kwarrel, somewhat mature but still had a bit of a jock attitude. As time went on and Kevin was accepted by Ben and Gwen, who were his most hated enemies in the past and now best friend and girlfriend respectively, his personality and psyche improved greatly to the point that he became a trustworthy and reliable ally and teammate. Although Kevin sometimes had relapses of delinquency, Ben and Gwen would look past this as they were now willing to trust him. In the third season of Alien Force, Kevin would once again be mutated by the Omnitrix; involuntarily absorbing feedback from it like the first time and became a living colossus composed of the various solid matter he had absorbed, including steel, Taedenite, and various types of stone. During this time, Kevin was visibly disgusted with himself because of his mutation and fluctuated between bouts of uncontrollable aggression and severe depression that almost jeopardized his relationship with his friends, especially Gwen. After the final battle with Vilgax and the destruction of the original Omnitrix, Kevin was restored back to normal and resumed life as a normal looking human. His relationship with his friends further contributed to his mental stability as he once told Ben in "Perplexahedron" that he was grateful to them for changing his life. Verdona once stated that Kevin's current personality is similar to a younger Max Tennyson's. This, coupled with their rivaling knowledge of alien paraphernalia, makes this claim not that far-fetched.

However, things took a sudden turn for the worse when Kevin was mutated once again. Only this time he was driven completely insane, becoming a monster that matched his grotesque form. Kevin became vengeful against everyone who had ever done him wrong, even if by the slightest fault. He was willing to hurt and kill anyone regardless of the consequences and could not be reached even by his friends, with whom he also vented his rage on. Kevin was unstable even more so than he ever was as a kid by being extremely violent, both physically and verbally. This is evident when he expressed his frustration against Ben the most for being a famous superhero and him being a monstrous freak. Having no control over his actions, Kevin became overwhelmed by an insatiable hunger for energy, even his friends. This drove him to attack and hurt anyone he knew to get their energies, regardless if they had powers or not. Even Gwen, who still believed in him, was willing to risk it all just to save him from going down further. At first, Kevin was trying to fight for control over his actions by not hurting Gwen because of what they had before his turning, but his resolve soon waned when he "tasted" Gwen's energy and eventually craved for her as well. Through the combined efforts of Ben, Gwen, Cooper and Darkstar. They were able to revert Kevin back to normal.

Ben 10
Kevin Levin was born to Devin Levin and Mrs. Levin. Devin; an Osmosian and a Plumber, was the rookie partner of Max Tennyson. After Devin died in the line of duty at the hands of Ragnarok, Kevin and his mother were left orphaned. Some time after Devin's death, Harvey Hackett came into their lives. Harvey fell in love with Mrs. Levin and married her, thus becoming Kevin's step-father; Kevin was only 4 years old at the time. Kevin wasn't fond of Harvey at the very least, especially since he saw him as a replacement of his deceased father. Harvey strove to be a good father figure to Kevin, whom he accepted and raised as his own, but it was undeniable that he was fearful of Kevin because of the boy's powers, which only worsened their relationship. When he was just eleven years old, Kevin somehow became charged with energy and demolished their old home. This, coupled with the mental instability for absorbing the energy and his initial dislike of Harvey, instilled in him the delusion that Harvey convinced his mother to kick him out in the street (although Harvey later made it clear that that was all a misunderstanding and that they didn't kick him out). Stealing a bike and wearing the padlock around his neck, he ran away and made his way to New York where he made his home under the city's abandoned subways.

Kevin is first encountered by Ben in an arcade, where, after befriending him, he was assaulted by bullies and saved by Ben as XLR8. The two attempt to steal video games from a warehouse and get caught by the police, forcing Ben to reveal his powers to him in order to escape. Eventually, Ben breaks off their partnership when Kevin rigs two trains (one carrying money and one carrying people) to collide, not caring that hundreds of innocent people would be killed. Ben became Heatblast to stop Kevin, but to even the odds, Kevin grabs onto Heatblast and absorbs his powers, changing him into an incomplete version of Heatblast. When Ben foils Kevin's plans and escapes, Kevin leaves to use his new powers to get revenge on the bullies that picked on him. But Kevin's new powers disappear and changes back to his regular form. When Ben shows up as Four Arms to stop Kevin, Kevin absorbs Four Arms' power and changes into an incomplete version of Four Arms. As Ben and Kevin fight, Ben gains the victory and offers Kevin a new home and a chance to be a good guy. Kevin accepts, but Ben realizes he lied and Kevin tries to take the Omnitrix off of Ben, but feedback from it changes Kevin back to normal and appears to be depleting his powers. He escapes and at the end of the episode reveals he still has Heatblast's powers.

Kevin serves as the main antagonist of the second season. His ability to project heat at the end of Kevin 11 is a result of the Omnitrix's feedback pulse: the amount of energy it emitted allowed him to fully absorb its powers, giving him access to every alien form Ben had at the time. However, because Kevin's ability to regulate this power is poorer than that of the Omnitrix itself, the energy suppresses his human form and forces him to remain as an alien most of the time.

As revealed in Framed, Kevin blamed Ben for this, so he used the powers of the Omnitrix to start a crime spree in Los Angeles, both for his own benefit and to damage Ben's (or rather, his alien forms') reputation. Eventually, Kevin's ability to regulate the power fails altogether, causing him to permanently mutate into what Vilgax would describe as a "misshapen, chaotic amalgam of creatures from the Omnitrix." This form has: Four Arms' head, body, left eyes, legs and feet, Grey Matter's right eye, Upgrade's upper back, Heatblast's left arm, Diamondhead's right arm, 2 of Wildmutt's arms below them, XLR8's tail, Stinkfly's wings, Ripjaws'' antenna, gills, and teeth and Ghostfreak's black lines running along his chest. Because of this, Kevin fights Ben and as he was about to kill him, Lt. Steel from the Special Alien Capture Team shoots him into the water and he is presumed dead, but at the end of the episode he is revealed to be alive.

After his mutation, Kevin gloats that he has all of Ben's original 10 alien powers plus his own, making him "Kevin 11" (the name Kevin is credited under in the ending sequence of the show). He has Stinkfly's ability to fly and spit slime, Diamondhead's diamond ability with his right arm, Four Arms' strength, Wildmutt's sniffing ability, XLR8's speed, Heatblast's ability to shoot fire out of his left arm, Ripjaws' biting and unhinged jaw (possibly also his ability to breathe underwater because he also has Ripjaws' gills) and Upgrade's laser vision. However, Kevin never exhibited his absorption powers while in this form and did not appear to have access to certain powers such as Grey Matter's intelligence, or Upgrade's mechanical merging. In addition, Ben notes that Kevin's powers weren't nearly as strong as the Omnitrix's aliens, as seen when Diamondhead was able to easily catch and crush one of Kevin's crystals with his bare hands while the others shattered upon hitting him without leaving a mark (this assessment is proven correct in Ultimate Alien as Aggregor stated that when Osmosians absorb the life force of other beings they only gain 1/10th of that being's powers).

During his third appearance in Grudge Match, Kevin attacked Ben to get revenge, blaming his condition on him. As the two battled, they were abducted and forced to fight in Slix Vigma's gladiator games. During their battles, Ben helped Kevin to realize the advantages of his mutated form: because Kevin 11 was an amalgam of aliens, he could mix and match their powers to make up for their reduced potency. Although forced to work together, Kevin's only goal was killing Ben. After Ben and Kevin succeeded in escaping, Kevin attacked Ben and pinned him to the wall with Stinkfly goo before moving in with a Diamondhead spear, gloating that no matter what alien Ben transformed into, he knew every one of them. Little did he know that Ben had discovered that there were more aliens in the Omnitrix and had unlocked Cannonbolt, whom he transformed into just as Kevin was about to skewer him before getting into an escape pod. Kevin nearly barged into the pod when he was stopped by Technorg, whom Ben had spared and he declared a life debt to. After Technorg helped Ben escape, he turned his attention to Kevin (who had called him a lap dog just as he was about to kill Ben). The two were transported to a different galaxy at the end of the episode while locked in combat. According to the advanced edition of the episode, after beating Kevin, Technorg left the ship to return to his homeworld while Kevin took the ship as his own.

Kevin returned in the episode Back With a Vengeance, where he teamed up with Vilgax to defeat Ben, and eventually managed to remove the Omnitrix with Vilgax's help. However, he betrayed Vilgax later in an attempt to leave both Ben and Vilgax in the Null Void and use the Omnitrix to take over the world, only for Ben to escape and leave him and Vilgax trapped instead. Kevin spent the rest of the series in the Null Void. A dream version of Kevin appears in Perfect Day, as a hall monitor of a dream version of Ben's school. In the dream, Kevin was human but then changed into his mutated form (which appeared uglier than it used to be, probably an exaggeration of Ben's fear of Kevin) and fought Ben. When Ben took control of the dream, he was then able to defeat the dream version of Kevin in one fell swoop.

Ben 10: Alien Force
Kevin comes back in Ben 10: Alien Force, where he was eventually released from the Null Void (he stated in Darkstar Rising that he did his time for his crimes) returned to his human form, and grows into a tall and muscular young man who reconciled with his family. He has also become an alien weapons dealer, giving him several contacts with criminals (such as Argit, Vulkanus and Sunder the Retriever) as well as a considerable knowledge in alien tech. He has also regained his ability to absorb solid matter.

In his first Alien Force appearance, Kevin attempted to organize a deal between the Forever Knights and the DNAliens in order to sell them level 5 weapons. However, the deal was interrupted by Magister Labrid, Ben and Gwen. Trying to get revenge, Kevin fought Ben, but was easily defeated while the other villains escaped without paying him. Labrid then forced Kevin to help them in finding back the weapon, offering him to avoid problems with the Plumbers then. Though Kevin mainly accepted in order to get his pay, Magister Labrid later sacrificed himself in order to save him from a defective weapon's explosion. This plus Kevin's interest for Gwen and his desire to become a Plumber like his father was, led him to agree to teaming up with Ben and Gwen against the High Breed invasion. Though he initially still felt a little rancorous toward Ben, Kevin slowly reconciled with him, and he proved to be a valuable ally as well as a good friend. Despite his reformation, Kevin still tends to engage in unethical activities: he is not above stealing gold and jewelry from the Forever Knights and Plumbers equipment from Manny Armstrong and Helen Wheels when presented with the opportunity ("Ben 10 Returns"; "Plumbers' Helpers"); attempts to sell the Rust Bucket to Vulkanus for alien technology, albeit technology he intended to give to Ben (Kevin's Big Score); and conspires with Argit to sell weapons to both sides of a warring race (Simple).



In Darkstar Rising, he reveals that his father was also a Plumber. He never met his father, but his mother told Kevin stories about what his father did. This is a big gap in the original series because in Ben 10, he said that his parents both left him because of his strange electrical powers; this was explained later on in the series as an exaggeration on Kevin's part: Kevin's mother remarried, and in retalliation Kevin destroyed their home and ran away. At the end of the same episode, Kevin, along with Gwen and Ben became official Plumbers, after which Kevin leaves to tell his mother about his membership, this suggests that he has now reconciled and rejoined with his family. Also in Darkstar Rising, when explaining that he wanted to be a Plumber for the sake of being just like his father, it "mostly" served as the reason that he joined the Tennysons in the first place (his promise to Magister Labrid and Gwen could be the other reasons). It was clearly implied his mother remarried after his real father's death, which could explain why he was kicked out of his house when he was 11. In the season 3 premiere, Vengeance of Vilgax, Kevin changed clothes and was subjected to a feedback pulse from the Omnitrix after Ben tampered with it. Because of this, he was unable to revert back to his normal human form, instead becoming a living colossus composed of different elements, including steel, wood, Taedenite, and stone.

Throughout the series he was shown to hate what he had become, to the extent of breaking things off with Gwen, wearing an I.D. Mask in public to appear human, and considering himself a monster. He also discovered that his father Devin Levin, an Osmosian Plumber, was murdered by an alien criminal named Ragnarok, and became bent on vengeance, so much so that he eventually left Ragnarok to his death when he had the chance to save him.

In the series finale The Final Battle, where Vilgax attempted to separate Ben from his friends, Kevin was kidnapped by Albedo in an attempt to split them up. He was also asked by Ben to back him up when taking on Vilgax, which he did. After Ben's Omnitrix was destroyed, he reverted back to human form, revealing that it was the Omnitrix's power that kept him that way.

Ben 10: Alien Swarm

In Ben 10: Alien Swarm, the live-action movie, Kevin is seen driving around with his car. The car is a green 2009 Dodge Challenger.

Also he is seen in his human form, with his Season 1-2 clothes and regular absorbing powers. Also when he absorbs solid objects, his voice sounds distorted. Near the climax he switches to his season 3 clothes revealing that they're a uniform for the garage built on top of a Plumber's base as cover.

Ben 10: Ultimate Alien
Kevin returns in Ben 10: Ultimate Alien, going back to his original Alien Force appearance, clothes and powers. According to Dwayne McDuffie, part of the series features more about his past (from the original series to be precise). Kevin still has the ability to change his hands into different weapons even after he returned to normal in Alien Force.

In Too Hot To Handle, Kevin is able to repair objects in the current matter he has absorbed by turning it into a liquid and then hardening it again.

In Fused, he admits he was selfish when he first met Ben. He also risked his life to save Ben from being taken over by Ra'ad. He also learns that there is another Osmosian named Aggregor. While never explained, Kevin shows sympathy to him though it could be possible the connection is because they are of the same race.

In Ultimate Aggregor, he shows his knack for detective work, and later warned by Professor Paradox to remember who his friends are and that things will get worse before they get better. Kevin explains to Aggregor that the reason that he was a villain in the original series is that when Osmosians absorb raw energy, they become insane.

In Map of Infinity, Kevin continues to focus on stopping Aggregor (but not more than Ben), Kevin is easily defeated by Aggregor since his powers have increased, Kevin also seemed to know about the Map of Infinity saying it did not exist, the group go in search of the first part of the Map, Kevin wears a Plumbers' Suit, unlike any other Plumbers' Suits, that Kevin had a little white glove and a circle over the glove (which gives access to Ultimatrix of Ben), possibly this glove is for Kevin to use his powers, he proves to be very strong when a giant hammer crushes the group on a wall, he survived and managed to save the group and remove the hammer from the wall.

In Deep, we see Kevin using a Plumbers' Suit with built-in electrical weapons. His helmet is destroyed, but Gwen uses her powers to make Kevin absorb the matter of his jet, saving him from being crushed by the pressure. However, Kevin still can not breathe, until a Little Fish acts as a "helmet" for him to breathe, in the core Kevin takes the Little Fish from his head (he did not need it since there was air in the core), Kevin also finds and tries to fight Aggregor it to retrieve the second part of Map of Infinity, unfortunately he is easily defeated by the electric powers of Aggregor, Aggregor says that next time Kevin should try absorbing something nonconductive, and runs away with the second part of Map of Infinity, leaving Kevin angry. Kevin leaves the Little Fish (who liked Kevin) in Piscciss and is comforted by Gwen at the end, as he seemed to miss the fish.

In Perplexahedron, When Ben and Kevin get separated from Gwen, Ben says that Gwen can take care of herself and Kevin replies, "That's why I like her." Kevin then talks about his feelings to Ben and how he owes it to them (Ben and Gwen) for putting him on the right path. After finding Gwen (by accident), Kevin tries to say that he likes her, a lot. Then Ben tells her what Kevin's trying to say, and Gwen says, "I know that already." and they kiss, the third kiss in the Gwen/Kevin relationship.

In The Forge of Creation, as a last resort to stop Aggregor from succeeding in his plans, Kevin absorbs the powers and abilities from the Ultimatrix's unlocked aliens, becoming strong and powerful enough to defeat Aggregor. Unfortunately, this also causes him to mutate and become insane once again as Ultimate Kevin. His old desire for power also returns as he absorbs Aggregor's abilities as well. However, Kevin's good heart appears to not be taken over completely, as he accepted 10-year-old Ben's harsh criticism, agreeing to stop absorbing powers and abilities for the time being. This new form has Jetray's eyes, right leg, and crest, Swampfire's left arm in the shape of Humungousaur's left arm, Rath's left claw and left foot (in Jetray's skin color), Diamondhead's right arm in the shape of Brainstorm's right claw (As of The Enemy of My Enemy this arm can turn into Goop's arm), Brainstorm's 2 short legs (positioned under Swampfire's left arm), Spidermonkey's arm under Diamondhead's right arm, Big Chill's wings and hooded-cloak, Humungousaur's tail, chest armor, body and head (his body and head are in Jetray's skin color), Chromastone's right shoulder spikes, and Lodestar's left shoulder spike, as well as the hair from his human form (similar to his first mutation). He has so far shown super strength, able to fly, use Jet Ray's neuroshock blasts, Brainstorm's lighting generation and manipulation, Swampfire's fire blasts, and Diamondhead's crystal manipulation, Goop's shape manipulation, NRG's heat rays, Big Chill's intangibility, Water Hazard's water generation, Lodestar's magnetic control and Armodrillo's ground pounding.

In Nor Iron Bars a Cage, it is revealed that back during his time in Incarcecon, a prisoner named Kwarrel approached him and offered to help him control his anger and find purpose. Seeing the con as a father figure, Kevin learned how to return to his human form and how his powers could allow him to absorb matter instead. Kwarrel then showed Kevin a tunnel he had been digging out of the prison to freedom. However, they were ambushed by Morgg who would one day become the warden. Kwarrel held off the guard for Kevin to escape, only to lose his life in the process. Out to avenge his death, even though it went against all that Kwarrel had taught him, Kevin purposely returned to the prison to kill Morgg. He very nearly succeeded if not for Ben and Gwen's interference. Believing that their friend is truly gone, Ben, much to Gwen's horror, suggests that Kevin must be put down.

In The Enemy of My Enemy, Kevin went after Argit for all the times he double crossed him. He first attacked him and sent him towards Ben and Gwen. He later attacked the Rust Bucket 3, but was forced to retreat due to his car being thrown off the plane. He then attacked the Plumber's Academy and easily took care of the plumbers. He then attacked and thought he killed Argit (due to Argit closing down his vital systems). During his attempt to kill Argit, he nearly kill Gwen, thinking she betrayed him. However, he restrains himself at the last second and spares her life, saying: "The only reason your alive is because of what you used to mean to me." before departing, we can determine that a part of Kevin still cares about her and Gwen remaining adamant that they can still bring Kevin back to sanity without killing him.

In Absolute Power, in hopes of trying to persuade Kevin to rejoin Ben and the gang, Gwen inquires the aid of Darkstar. However, Ben is very furious with the idea. This is Ben and Gwen's last hope of trying to bring Kevin back. Gwen tries to talk to Kevin, who tells her he's been avoiding her because he can't control himself, implying that he doesn't want to hurt her; but he gains the desire to absorb Gwen's powers after taking a "taste". After Ben defeated Kevin with Ultimate Echo Echo, Cooper finished the machine that would siphon all of the energies that Kevin had absorbed and subsequently cure him with it. Darkstar then betrays the team by using the piece of the Dominus Librium to transfer all said energies into himself, which backfires when Ben; anticipating such a move, activates a switch to return all of the energies back to where they belonged, Kevin then knocks him out with a punch. Kevin, now back to his human form and of sane mind once again, thanks Cooper. He is then given a passionate kiss on the lips by Gwen (much to the disappointment of Cooper) and gets into a argument with Ben about their previous fight, to which he is relieved that everything turned out alright, after which Gwen asks for their help in explaining to her parents about the damage done to their home, to which Kevin and Ben ditch by voting to go to Mr. Smoothies instead, with Kevin buying.

Powers and Abilities
Kevin's powers generally revolve around absorption, either of energy, DNA, life force, or of matter. In Ben 10, Kevin can absorb energy and manipulate machinery to a minor extent though the energy he uses is finite, so he is required to steal more. By absorbing energy from the Omnitrix or Ultimatrix, Kevin can temporarily take on attributes of any alien form Ben has currently taken on.

In Framed, it is revealed that Kevin is able to assume any of Ben's starter alien forms at will for as long as he wants without first changing back to human, due to having absorbed sufficient energy from the Omnitrix. Despite this advantage over Ben, he is still defeated. The rage, combined with all of the DNA he absorbed, caused his absorption power to spiral out of control, mutating him into a hulking behemoth fusion compromised of the ten starter Omnitrix aliens with no way to revert back to human form. The powers he had from his original mutation made up the major components of his body and where the aliens he used the most (Stinkfly's flight and toxic saliva, XLR8's speed, Fourarms superhuman strength, Wildmutt's strength, agility, and senses, Diamondhead's crystal projections, Heatblast's pyrokinesis, and Riplaw's angler and gills). He remains in this form for the remainder of Ben 10. According to the enhanced version of Framed, Kevin's human DNA restores itself over time, allowing him to return to his human form by force of will, though he was unable to return to his human form due to him having lacked this knowledge (this is shown in Nor Iron Bars a Cage where an alien named Kwarrel helped Kevin reverse the mutation and control his powers, likely with Kevin learning that his DNA had restored itself enough so that he could return to his human form). It is revealed in Ultimate Aggregor that when Osmosian absorbs raw energy or a being's DNA without control (like the Omnitrix or the Andromeda Aliens), it causes them to become mentally unstable, much like what happened to Kevin, which explains his violent, sociopathic behavior in the original series.

In Ben 10: Alien Force (5 years after the original series), Kevin returns in human form with his absorption powers intact. However, he is now also able to absorb the properties of materials into his own being (e.g iron, copper, rock, nickel), transmuting himself into a living form of whatever material he has absorbed and subsequently use it to proportionately increase his physical strength and durability. It is revealed in the episode All That Glitters that the transmutation actually serves as a second skin/coating that eventually peels away as he takes damage. However, while fighting a Techadon, the war robot blasted a hole straight through Kevin in rock/concrete form, but he demonstrated minor regenerative abilities by absorbing metal to cover the hole. In the episode Plumbers' Helpers, Kevin can absorb multiple materials at once, as demonstrated by absorbing both nickel, copper and zinc (from loose change in his pocket). He requires a decent amount of material to completely encase himself. This ability has once been used productively when Kevin was forced to synthesize a coating of a living gem known as Taedenite, thus incapacitating him; Vulkanus mentioned that it's the rarest gem in the galaxy, and with the amount he chipped off from Kevin he was able to buy a permit to "renovate" the Earth, and Paradox mentioned in Vilgax Attacks that with the amount Vulkanus chipped off of Kevin he has the largest stash in the galaxy.



In the Alien Force season 3 premiere, Kevin loses the ability to revert to his human form after a feedback blast, caused when Ben tampers with the Omnitrix and Kevin tries to remove it to help Ben, turning him into a living colossus composed of the various solid matter he had absorbed, including steel, Taedenite crystals, and various typed of stone. In addition, Kevin's superhuman strength and durability is further enhanced and gains limited regenerative and shape-shifting abilities, seen when he shifts his hands into a variety of different tools, such as a mace, a hammer, a sword, and large clippers. In The Final Battle: Part 2, he was turned back to normal and got his old powers back after the Omnitrix self-destructed. In Ben 10: Ultimate Alien, Kevin was shown to be able to still shapeshift his arms into weapons after his mutation is reversed. Dwayne McDuffie revealed the reason for this is due to him now having knowledge of doing so. In Too Hot To Handle, Kevin's abilities have shown to develop more, allowing him to release a liquid version of whatever material he has absorbed and manipulate the substance he has absorbed, as shown when he repaired the rock ceiling of a mine, fused the seal of P'andor's suit, and morphed it around P'andor and fused the arms together as makeshift handcuffs.

Other Skills
Even without his powers, Kevin is shown to be far stronger than a baseline human. While not to the same extent as aliens like Fourarms and Diamondhead, Kevin has shown on several occasions to be able to lift and throw the combined weight of several people and and resist impacts and physical trauma that would severely injure an ordinary person with moderate discomfort.

Kevin also has some noticeable skill in martial arts which he gained during his years as a runaway, a prisoner in Incarcecon, an alien tech dealer, and a member of the Plumbers. Even when he was only eleven, Kevin proved on several occasions to be a highly formidable fighter, having held his own against and defeated opponents such as Vulcanus and Vilgax, something that Ben never accomplished. In addition, Kevin has a vast scientific and technological knowledge about alien tech thanks to his time as a con and his involvement in the alien black market, making him the team expert in this area. Not only does he have great knowledge in technology, he also has great deductive skills, having been able to determine specifically what happened in a battle between Aggregor and the Plumbers several hours after the battle, greatly impressing his friends and even gaining a compliment from an experienced Max.

In episode Deep, when Kevin, Ben, and Gwen travel to planet Piscciss, an event occurs when a large sea creature attacks their ship and steals Gwen. Him and Ben both argue that they both cannot use their powers while being in their plumber suits. So Kevin claims that he made some 'alterations' to the suits, saying that he equipped them with propelling units and neural shock pulses allowing them to attack with electric shocks with every blow they make.

Trivia

 * It is explained that Kevin's initial attraction to Gwen was because of the Osmosians innate sense and insatiable hunger for energy. However, Kevin loves Gwen more as a person which was why he was able to resist draining/hurting her in The Enemy of My Enemy, but after having a "taste" of her energy in Absolute Power Part 2 he was overwhelmed by his hunger and attempted to drain her dry.
 * According to Dwayne McDuffie, Kevin's superhuman strength and durability is a natural part of him that is enhanced when he absorbs matter, rather than being a direct result of the matter he absorbs (with McDuffie being quoted saying: "Who said that's what gives him super strength?"), indicating that all Osmosians possess some form of minor superhuman strength and durability. This would make sense, as when Kevin absorbs solid matter, the matter forms a durable coat of armor but does not become a part of him, meaning that whenever Kevin moves after having absorbed matter, he is bending the armor to his body.
 * Kevin has shown a willingness to kill - especially if he has a vendetta against that person. This is evident even when he has not absorbed energy, as shown when he suggested to permanently take down anybody who threatens his family. It is only when he is a mutant that he is more than willing to kill, i.e. Ragnarok, Zombozo, Aggregor, Argit, and Morgg.
 * Although it looks like Kevin has black hair, it is really raven-colored.
 * In the Alien Force season 2 finale War of the Worlds: Part 1, it is revealed that Kevin's middle name is Ethan, making his full name Kevin E. Levin, officially connecting the pun to his old nickname "Kevin 11". Ben finds this extremely hilarious, saying that he has lost "all remaining pretense of cool".
 * So far, Kevin has been mutated in all three series.
 * He is part Osmosian. Even though his parents supposedly abandoned him (this was probably a misunderstanding on his part, as he was unstable at the time) Kevin's mother is still around as shown at the end of Darkstar Rising, when he tells Ben and Gwen that he will tell his mother about his new Plumber's Badge, and at the beginning of Vendetta, where Kevin's mom made her first appearance on the show. Kevin's abandonment was later confirmed to be just a misunderstanding by his step-father.
 * Kevin has been unable to transform back to his human form three times. Each time was from tampering with the Omnitrix/Ultimatrix.
 * Like Ben, Kevin is a big fan of Sumo Slammers, as he is thrilled when Ben tells him there is going to be a Sumo Slammers Movie in the episode Vengeance of Vilgax: Part 1, though later he calls it boring and acts as if he had never seen it. He also may have grown out of it (but is still fond of the idea of a Sumo Slammers Movie). It is notable that the first time Ben and Kevin worked together in Kevin 11, they attempted to break into a warehouse to steal the new, unreleased, Sumo Slammers video game together.
 * In Con of Rath, during a battle with Vulkanus he reveals that he has dreams where he is confronted by his old enemies who try to hurt him. He assumes that everybody has dreams like that, only to discover he was mistaken when Gwen says "I don't have dreams like that."
 * Interestingly, Kevin's hometown is Bellwood, the same as Ben's even though in the episode Kevin 11 he lives in New York City. The enhanced version of the episode Kevin 11 revealed that when Kevin ran away he stole a bike, the lock to which he was wearing around his neck at the time of the episode.
 * Kevin was stuck in his mutated form in Alien Force because of the Omnitrix. After the Omnitrix has self-destructed, he was turned back to normal.
 * Kevin's powers are similar to the Marvel villain, the Absorbing Man, as both are able to absorb solid matter and shape-shift their limbs into makeshift weapons. However, unlike him, Kevin only becomes a solid form of whatever he absorbs, coating him with a protective layer of said material. The Absorbing Man was actually able to become an organic form of what he touched.
 * Kevin's ability to absorb a being's life force, DNA, and powers are also similar to the Marvel hero Rogue. Interestingly, both characters are also driven insane when they have absorbed too much energy and end up turning against their allies. Also, Kevin's insecurities and fears are also similar to Rogue's.
 * Additionally, during Kevin' mutations, he is similar to the DC hero, Metamorpho. Both had the ability to reshape their bodies as they wished, being comprised of different elements that can be manipulated. However, Kevin was only solids, while Metamorpho was liquids and gases in addition to solids. Kevin could not change his body to different elements as well while Metamorpho could. Interestingly, Kevin shared Metamorpho's insecurities and self-hatred over their mutated appearance.
 * Kevin's mutations resemble that of the alien mutant super villain from "Men in Black: The Series" named Alpha. Alpha is able to absorb aliens into his body and access all of their powers and abilities at will, similar to that of Kevin's abilities. After absorbing several aliens, Alpha's body takes a mismatched shape of the aliens he has absorbed, resembling that of Kevin's first and third mutation.
 * In Ghost Town, Kevin says that he is a fan of Whack-a-Mole this may have just been a joke.
 * In the original series when Kevin was a mutant combo of Ben's 10 starters, he did not appear to have the powers of Grey Matter (size and intelligence), Upgrade (melding with technology), and Ghostfreak (invisibility and intangibility) even though their body parts can be seen on him, possibly being almost useless at one-tenth of their respective powers.
 * It appears that Kevin doesn't go to school like Ben and Gwen, although he once mentioned that he learned Astro Physics on the streets, implying that his education is more "practical".
 * Technically, Kevin was the first Osmosian villain (as well as the first Osmosian to appear) in the Ben 10 series (though he is only half-Osmonsian), with the second being Aggregor (who happens to be full Osmosian).
 * According to Aggregor, Kevin is considered a "hatchling" to Osmosians.
 * When Kevin forms weapons out of his hands he resembles another creation by "Man of Action," Generator Rex.
 * When Kevin returns to his human form in Trade-Off and The Final Battle: Part 2, he is seen with what looks like black briefs. Dwayne McDuffie has confirmed that this is in fact simply a black skintight swimsuit.
 * Kevin still has the power and ability to absorb any type of energy and release it at will, but does not want to because of its previous side-effects. So far, since Ben 10, ha has only willingly used his energy absorption powers once to absorb the DNA and energy of the Ultimatrix in a last resort attempt to stop Aggregor. However, because he absorbed the energy feedback without control, it ended up causing him to become mentally and physically unstable similar to what happened to him during the original series.
 * According to an Ultimate Alien comic which was found in a K-Zone magazine, Kevin mentions that he hates wearing green jackets, in reference to Ben's green jacket.
 * In the episode Darkstar Rising, Kevin said that he had never met his dad, but in Vendetta, he is shown in a picture with him. (Dwayne McDuffie said he was either lying, or he was too young to remember.)
 * When Kevin introduces himself to Ragnarok in Vendetta, he makes an oblique reference to the Princess Bride, saying; "My name is Kevin Ethan Levin, you killed my father, prepare to die," echoing the famous quote of the book, "My name is Inigo Montoya, you killed my father, prepare to die," (repeated). According to Dwayne McDuffie, Mrs. Levin had read the book to him as a child.
 * In Deep he befriended (in a sense) a strange bubble-like fish that acted similarly to a dog(similarly to Ship) that saved him from drowning by swallowing his head acting like a helmet, but did not keep it as Ben did with Ship unfortunately and let it go. He was notably saddened by this which Gwen commended as noble.
 * In FusionFall, Kevin wore his outfit from Alien Force Season 1 and 2, but in February 2010, he now wears his outfit from the third season of "Ben 10: Alien Force."
 * Even though Kevin's third mutation is supposed to be an amalgamation of all Ben accessible aliens (except Alien X as it had second lock activated at the time), his new form does not have any visible characteristics from Armodrillo, Water Hazard, AmpFibian, NRG, Terraspin, Nanomech, Cannonbolt, Way Big, Upchuck, Ripjaws, Goop, Ghostfreak, Wildmutt, and Echo Echo. In a sense he has a characteristic of Four Arms due to having four sets of appendages. Despite this, he does have the powers of the aliens as seen in The Enemy of my Enemy when he used the powers of Goop, Water Hazard's, NRG, and Terraspin (as he was unaffected by mana like the rest of Terraspin's race).
 * His third mutation does not seem to have the same set-back as his first (only 1/10 of the aliens powers) as he was strong enough to defeat Aggregor in The Forge of Creation, and in The Enemy of my Enemy, he used Big Chill's intangibility without a hitch, which does not seem possible if he only had 1/10 of the power. This may be due to the Ultimatrix having less restrictions than the Omnitrix as well as more energy, which may explain Kevin's lack of a power set-back during his third mutation.
 * Since Kevin easily defeated Ultimate Aggregor in his third mutated form, that would make him the most powerful enemy they have ever fought.
 * Alien Force is, so far, the only series where, when Kevin is mutated, doesn't go crazy. This may be due to him having absorbed the physical properties of solid matter instead of raw energy or alien DNA.
 * His third mutation is the only mutation not caused by the Omnitrix but instead the Ultimatrix.
 * He is shown to still like his car in his 3rd mutation.
 * In both Kevin's Omnitrix/Ultimatrix mutations, his right arm is made of Diamondhead crystal and his left arm belongs to the fire-type alien in Ben's lineup.
 * After absorbing a little of Gwen's power, Kevin says "Hello, Lovely Gwen" which is one of Darkstar's catchphrases when greeting Gwen.
 * Kevin's 3rd mutation was cured with the use of the Dominus Librium. However, when it temporarily cured Kevin's 2nd mutation in Trade-Off, he lost his powers as a result. However, Ben also says in Absolute Power Part 2 that all of the power Kevin stole and Darkstar stole (using the Dominus Librium) had returned to where it belongs. Since Darkstar had temporarily absorbed Kevin's Osmosian absorption powers, this would mean that Kevin still has his natural absorption powers, as they returned to where they belonged after Ben deactivated the Domius Librium
 * Kevin is revealed to like soap operas in Hero Time.

Video Games
Kevin appeared in every version (Wii, DS, PSP, PS2) of the game as the villain at the end of the Lumber Mill level and the second mini-boss in the secret challenge of the Null Void level.
 * Ben 10: Protector of Earth (Villain)

Kevin appeared in every version (Wii, DS, PSP, PS2) of the game, like the previous game. Unlike the previous game, Kevin is playable only on the Wii, PSP and PS2 version of the game. He is playable for 2 levels, and for 1 level he was taken over by a Xenocyte and became the boss for that level.
 * Ben 10: Alien Force (Playable Character)(And boss)

Kevin appeared once again in every version (Wii, DS, PSP, PS2, Xbox 360) of the game. He is not a playable character in any of the versions.
 * Ben 10 Alien Force: Vilgax Attacks

Kevin appeared as the first boss where he was taken over by the Techadon gauntlet.
 * Ben 10 Alien Force: The Rise of Hex

Kevin is seen in most of the clips in between levels.
 * Ben 10 Ultimate Alien: Cosmic Destruction

Ben 10

 * 4 inch Alien Collection normal Kevin 11
 * 10 cm DNAlien mutant Kevin 11
 * Sumo Slammers mutant Kevin 11

Ben 10: Alien Force

 * 4 inch Alien Collection normal Kevin 11
 * 10 cm DNAlien normal Kevin 11
 * Kevin's battle cruiser (car) - includes metal Kevin 11

Ben 10: Ultimate Alien

 * 4 inch Alien Collection normal Kevin 11 (unreleased)
 * 4 inch alien collection Ultimate Kevin (December~January)