Kevin's Mutations

Kevin's mutations are caused by his Osmosian ability to absorb virtually any type of energy or matter. By absorbing the DNA and energy from Ben's aliens or from the Omnitrix or Ultimatrix, the gene-splicing energy combined with the DNA will cause him to mutate into an amalgamation of most, if not all of unlocked aliens.

Ben 10
In the original series, Kevin simply absorbed electricity or the DNA from Ben's current alien form, turning him into an incomplete but effective version of that alien, earning the abilities of the alien he had absorbed. Shortly after trying to get revenge on a gang of bullies that had threatened him, he was exposed to a massive energy feedback that he inadvertently absorbed. The energy was sufficient enough so that Kevin could shapeshift between any of the original 10 aliens in the Omnitrix. However, his ability to regulate the power was weaker than that of the Omnitrix, forcing him to stay in an alien form most of the time. Later, during a fight with Ben on the Golden Gate Bridge, Four Arms put Kevin into submission and, at first, looked like he was going to kill him. Instead, he deliberately missed and walked away, stating that Kevin was never worth it. Kevin however, wanted to continue fighting and became enraged. His rage, combined with all of the energy and DNA he absorbed, caused his powers to spiral out of control, causing him to mutate him into a hulking chimerical behemoth fusion of the 10 original starter aliens of the Omnitrix, which Kevin dubbed Kevin 11 (due to having all of the powers of the 10 starter aliens from the Omnitrix plus his own powers). Kevin 11 was powerful, but only had, or showed, the abilities of the aliens most obvious in his of all ten of Ben's aliens. Vilgax called Kevin 11 "a misshapen chaotic amalgam of creatures... from the Omnitrix", his powers weren't as strong as Ben's pure versions and only had one-tenth of their original strength (though in terms of physical strength and durability, he was stronger than Four Arms). However, he is capable of mixing the abilities to his advantage, such as using Heatblast's flames and Stinkfly's goo to form an explosive attack, or using XLR8's speed, Four Arms's strength, and Diamondhead's invulnerability for, as he put it, "one mean punch". Kevin 11 also proved strong enough to hold his own against the Megacruiser robots, Technorg, and even Vilgax in a one-on-one fight.

After approximately 5 years in the Null Void, his human DNA overwrote the alien DNA, causing Kevin to lose this form in the Alien Force timeline. However, in the Ben 10,000 timeline he kept absorbing alien DNA, becoming Kevin 11,000.

In the Ben 10,000 timeline, Kevin had a son, Devlin Levin who could could transform into his father's original chimerical mutant form, though Devlin did not have the same power set-back as his father.

In the Ultimate Alien episode ...Nor Iron Bars a Cage, it is revealed how Kevin changed back to normal from this mutation. When he becomes a prisoner after being trapped in the Null Void, he was met by another prisoner named Kwarrel, who Kevin soon came to help for. Kwarrel taught Kevin how to control his anger and powers. Soon enough, Kevin becomes sane again, and returns to his human form.

Appearance

 * Kevin's hair, ears (Four Arms' skin), and cargo shorts.
 * Four Arms' frame, arm count, left eyes, legs, head, and torso.
 * Heatblast's upper left arm.
 * Stinkfly's wings.
 * Upgrade's upper back.
 * Diamondhead's upper right arm.
 * Ghostfreak's track.
 * Grey Matter's right eye.
 * Wildmutt's lower arms and gills/nose on his face.
 * Ripjaws' lure (Four Arms' skin), teeth, and gills on his torso.
 * XLR8's tail.

Powers and Abilities

 * Kevin: Matter and energy absorption
 * Four Arms: Super strength
 * Heatblast: Fire blasts
 * Stinkfly: Flight and slime spit
 * Diamondhead: Shapeshifting arm, crystal shards, and invulnerability
 * Wildmutt: Superhuman agility, senses, and quills
 * Ripjaws: Glowing lure, underwater breathing, and steel-bending jaws
 * XLR8: Super speed

Ben 10: Alien Force
In Vengeance of Vilgax, while Ben was trying to hack the Omnitrix, the Omnitrix overloaded. Kevin tried to help Ben by trying to override the system, but instead he got blasted by the feedback that the Omnitrix created. The blast rewrote his Osmosian DNA, causing him to mutate into a segmented, living colossus composed of the various matter aliens in the Codon Stream are made of. During his time in this form, Kevin learned that he can shapeshift his limbs into various tools, weapons, and forms and had limited regenerative abilities. In addition, his enhanced strength and durability were further increased.

In Trade-Off, Kevin teamed up with Darkstar to turn back to normal. He succeeds but lost his powers, making him useless in battle to the team. Gwen finds out what he did and goes after Darkstar. Darkstar then absorbs all of her power, and Kevin realizes the only way to save her is to stop Darkstar. After stopping Darkstar, he got his mutation back (so did Darkstar), and Gwen was saved.

In Time Heals, Gwen tried to turn him back to normal by going back in time and stopping the disaster, but later learned that it had to happen after Charmcaster imprisoned Ben and made Kevin a rock slave.

Kevin turned back to normal in The Final Battle: Part 2 when the Omnitrix is destroyed. According to Max, it must of been the Omnitrix's energy what had kept him in that form, meaning that, unlike his first mutation, his DNA would not have restored itself so long as the Omnitrix was functioning.

Appearance

 * Kevin's frame and briefs.
 * Taedenite: Left half of his face.
 * Concrete: Right half of his face, left half of his chest and back, upper right half of his chest and back, and left arm.
 * Metal: Lower right half of his chest, upper right half of his back, lower back, stomach, and right arm.
 * Wood: Legs.

Powers and Abilities

 * Enhanced strength and durability, limited regenerative abilities, weapon manifestation

Ben 10: Ultimate Alien
In The Forge of Creation, in order to stop Aggregor from absorbing the powers of a newborn Celestialsapien, Kevin had no choice but to absorb the Ultimatrix's powers and turn into, as Vilgax would call it, a misshapen chaotic amalgam form of the creatures of the Ultimatrix. This form, dubbed Ultimate Kevin, is very powerful and very quickly and easily defeated Ultimate Aggregor and drained his powers. However, Kevin's personality has become even worse than it was in the original series.

Throughout ...Nor Iron Bars a Cage, The Enemy of My Enemy, and Absolute Power, Ultimate Kevin goes rampant on attacking people who either owed him or he wanted revenge on. Fortunately, Kevin still seems to have some control his sanity, as he spared an opposing Gwen. Either way, Kevin is too powerful for anyone to beat and Ben thinks "putting him down" is the best option.

In Absolute Power, Kevin's self-control is almost entirely overtaken by his insanity. His Osmosian instincts have caused him to develope an insatiable hunger for energy and begins draining the life force of anyone unfortunate enough to cross his path, regardless of whether or not they had powers. Ben still thinks that eliminating Kevin once and for all would be the best choice.

thumb|right|200px|Ultimate Kevin into Kevin Gwen, however, sees that the power is controlling Kevin's mind. Gwen puts her own life at stake and tries to help Kevin by talking. He reveals to her that he still had a single shred of his humanity that let him stay away from Gwen, knowing that his remaining willpower would be overwhelmed by his insanity and that he would end up draining her if he got the chance. Ultimately, despite his love for Gwen, Kevin is overwhelmed by his hunger and he ends up partially draining her of her life force and powers, nearly killing her. He then becomes obsessed with her overwhelming amount of energy and ends up tracking her over the rest of both episodes (though his feelings for her prior to his mutation become mixed with his insanity, as seen when he commenting that he thinks she's deliberately avoiding him and how he shows anger when Cooper tries to stop him from killing her and tries to kill him as well).

Ultimate Kevin was cured in Absolute Power: Part 2, thanks to the efforts of Ben, Gwen, Cooper, and Darkstar. However, Darkstar becomes Ultimate Darkstar by absorbing the powers from the Dominus Librium which had absorbed Kevin's powers. Fortunately, Ben anticipated this from the beginning and presses a button which not only strips Morningstar's new powers, but returns the abilities to their rightful owners as well as reviving the five Andromeda Aliens.

Appearance

 * Kevin: Hair and jeans.
 * Four Arms: Frame, arm count, and torso.
 * Lodestar: Right foot, left shoulder spike and right claw.
 * Jetray: 3/4 face.
 * Diamondhead: Right arm structure.
 * Spidermonkey: Lower right arm.
 * A hooded blue cape modeled after Big Chill's cloak (in The Enemy of My Enemy, Kevin could wrap the cape around him to form a cloak) that can unfold into a pair of wings and antennae.
 * Swampfire: Left arm structure.
 * Humungousaur: Chest plates and tail.
 * Ultimate Humungousaur: 1/4 face.
 * Chromastone: Right shoulder crystals.
 * Brainstorm: 2 legs in place of a lower left arm.
 * Goop: Right arm (can turn into Lodestar's right claw).
 * Rath: Left arm, left wrist claw, and left foot.
 * Water Hazard: Water ports.
 * Ultimate Spidermonkey: Lower jaw.

Used Powers and Abilities

 * Kevin/Aggregor: Energy and matter absorption
 * Swampfire: Fire blasts, seeds and chlorokinesis
 * Ultimate Humungousaur: Super strength
 * Big Chill: Ice breath, flight, and intangibility
 * Chromastone: Ultraviolet blasts
 * Brainstorm: Electric blasts, force fields, and telekinesis
 * Jetray: Neuroshock blasts
 * Goop: Liquefaction and stretching
 * Rath: Wrist claw and aggression
 * Diamondhead: Shapeshifting arm and crystal shards
 * Water Hazard/Bivalvan: Water blasts and invulnerability
 * Armordrillo/Andreas: Jackhammer arm
 * Terraspin/Galapagus: Aerokinesis
 * NRG/P'andor: Radioactive energy beams
 * AmpFibian/Ra'ad: Levitation
 * Echo Echo: Sonic scream
 * Ultimate Spidermonkey: Web spit
 * Lodestar: Magnetism manipulation
 * Alan Albright: Pyrokinesis
 * Gwen/Rock Monsters: Mana blasts
 * Manny/Fourarms: Super strength

Alternate Timeline
In the episode Ken 10, which takes place in one of the possible futures, Kevin escapes the Null Void with the help of his son Devlin and declares that during his time there, he absorbed the power of all other aliens trapped with him, becoming Kevin 11,000.

Appearance

 * Heatblast: Torso, right tentacle, head flame, and right shoulder flame, left wing in the shape of Stinkfly's.
 * Four Arms: Body frame, feet and left arm.
 * Ghostfreak: Head shape, right eye, and body track.
 * Wildmutt: Lower arms.
 * Upgrade: Tentacle jutting out of the left forearm.
 * Null Void Guardian: Tentacles.
 * Stinkfly: Wings.

Known Powers and Abilities

 * Kevin: Energy and matter absorption
 * Stinkfly: Flight and toxic saliva
 * Can shapeshift his right tentacle in a similar fashion to Diamondhead
 * Can release electricity from his left tentacle similar to Buzzshock
 * Benwolf: Sonic howl
 * Four Arms: Super strength
 * XLR8: Super speed
 * Wildmutt: Superhuman senses, agility, and quills

Pyronite DNA
Kevin is mutated in this form when he absorbed Heatblast's Pyronite DNA, when Kevin wanted to crash two trains, one filled with passengers and the other filled with money that he wanted to steal, so Ben attempts to stop him as Heatblast but Kevin sneak behind him and absorbs Heatblast's DNA. Kevin looked like an incomplete version of Heatblast, having a different face, one of his arms mutated and part of his chest while displaying Heatblast's pyrokinetic abilities.

Tetramand DNA
Kevin is mutated into this form when he absorbed Four Arms Tetramand DNA. As the form of six arms, Kevin goes to the bridge where the gang that bullied him lived while Ben and the others travel there to prevent this from doing something stupid, Ben comes before and Four Arms while Kevin absorbs Four Arms DNA. The mutation left Kevin with Fourarms left eyes, his right human eye, his hair, black nails on his upper arms, and four additional human arms.

Stone Creature
It is not known exactly when Kevin takes this form, this happens in the Time Heals, it is believed that Kevin was forced to absorb one of Charmcaster's Stone Creatures, thus giving Charmcaster full control over Kevin.

After ignoring Professor Paradox's warnings about Time-traveling, Gwen changes the future by preventing the hacking of the Omnitrix and the mutation of Kevin, but after succeeding and returning to her timeline, she sees what could happen in the future if the accident had never occurred, making Gwen rearrange everything again back to the way it was.

This mutation left Kevin with rock skin, purple eyes and having Charmcaster's Stone Creatures motifs imprinted over his body.

DNAlien Kevin
In Ben 10 Alien Force the game Gorvan atached a Xenocite to Kevin forming DNAlien Kevin. He retains Kevins matter and energy absorbing powers and also posesses the slime spit of a DNAlien.

Trivia

 * Kevin's mutations are an Osmosian trait (which he inherited from his father Devin Levin) as the full Osmosian villain Aggregor is shown to be capable of absorbing and assimilating alien DNA which allows him to gain their abilities and causes a slight mutation (though nowhere as extreme as Kevin's). Kevin's mutations are a result of this ability, though he is unable to control his mutations and has trouble keeping a stable mental state due to inexperience (as Kevin 11,000 is able to keep a stable mental state and has shown the ability to retain certain alien abilities he has absorb while in human form, such as XLR8's super speed).
 * Kevin's alien mutations all have the frame of Fourarms (red, bulky, and two sets of arms).
 * During his third mutation, Kevin's wings seemed to have shape-shifting abilities as whenever the hood unfolded it seemed to be thinner than when folded up and the wings seemed to lose and gain certain aspects/parts when unfolding and would "fuse" together to form the cape when folded up.
 * Each of Kevin's canon mutations have a unique trait to them before/after being cured for example:
 * 1) After being cured from his first mutation, his clothes are completely intact even though the initial transformation completely destroyed his clothes (except his cargo shorts).
 * 2) His second mutation destroys his clothes completely (except his briefs). This isn't undone upon being cured like the first mutation His second mutation is the only one in which he retains his original body frame and does not lose his sanity that was because it was not an alien mutation like the first, but it rewrote his Osmosian DNA and he did not absorb the feedback.
 * 3) His third mutation, unlike the first, doesn't restore his clothes, with only his pants intact.
 * 4) When Ben hacked the Omnitrix and damaged it during Alien Force, it sent out a wave of energy that rewrote Kevin's Osmosian DNA, only possible because of his Osmosian ability to scan, absorb, and infuse himself matter and the DNA of other life forms.