Ken 10

Ken 10 is the forty-sixth episode of Ben 10.

Plot
Ben 10,000 is fighting Vulkanus (as seen in "Perfect Day" and "The Galactic Enforcers") and sends him into the Null Void. He then gets home just in time for Ken's birthday party. The relatives come and give him gifts; Gwendolyn (Gwen) gives him a rock pet (as seen in "A Change of Face" and "Tough Luck"), Max gives him a hoverboard and he receives an Omnitrix from Ben.

When Ben leaves to go fight more crime, Ken turns into XLR8 and races with him. While fighting, people and aliens watch the fight (also a kid that looks like Kevin while they were fighting Mot Snikrep).

Ken finds out that Ben put a limiter on the Omnitrix to keep Ken from heroing on his own and is displeased because Ben won't let him fight. So he becomes friends with Devlin (the kid who looks like Kevin) after playing on his hoverboard. Gwendolyn talks to Ben about kids and their ways making Ben decide that the next time there's an attack, they'll fight together.

At night, someone tries to attack Ben and Ken. Ben finds the intruder is Kevin. Ben tells Ken to go to his room because he's too strong, unwilling to let Ken fight despite the promise he made.

The next day, Ken tries to find the Null-Void on his own with Devlin hoping to impress his father by finding out how Kevin escaped the Void. Turning into Ditto, Ken finds the Null Void chamber and much to his horror discovers that Devlin is the son of Kevin, who had attacked the house last night in search of the chamber using Kevin's original mutant form. Devlin releases his father just in time for Ben to arrive. Kevin reveals that being imprisoned in the void was the best thing that ever happened to him as he has now absorbed that powers of 11 000 aliens and transforms into a even more monstrous form than before. Kevin mercilessly attacks Ben, Ken and even his own son Devlin. While Ben takes the fight outside Ken has a idea to defeat Kevin.

Ben still fights Kevin, but as before weakens Ben, making him revert back to human form. Ken comes in as Grey Matter and later switches to Spitter, then Buzzshock. Ken reveals he used Grey Matter's brain to remove the Omnitrix's limiter so he can switch forms at will. Kevin grabs Ken and is about to throw him, but Devlin comes in to defend him. Devlin explains why he freed Kevin - he wished his father would have cared about seeing his son again but instead finds that he doesn't care at all as he is only willing to kill the Tennysons. Devlin cries upon this realization but then resumes fighting against his father. Ken turns into XLR8. Devlin and XLR8 are thrown away and XLR8 reverts back into Ken who passes out.

Ben wakes up and sees what happened to Ken, angering him. He turns into Way Big to mercilessly crush Kevin, who reverts back into human form, but is still strong. Kevin is about to kill Ben and Ken, but Devlin imprisons Kevin in a Null Void Grenade (A small grenade-like device capable of imprisoning aliens inside of it). Max states that he has a 'special place' reserved for Kevin so he can't absorb any more alien DNA. Ken asks Ben if he can use all ten thousand of his heroes, but Ben says not to push his luck.

Devlin is about to leave until Max grabs him. Ken says he should stay with them, so Devlin becomes part of the Tennyson family. Later, Ken's rock pet regenerates and is alive again making him happy.

Major Events

 * Ben's son, Kenny celebrates his 10th birthday.
 * Kenny obtains his own Omnitrix.
 * Kenny meets Devlin.
 * Kevin escapes from the Null Void, but gets defeated by Ben as Way Big.
 * Devlin moves in with the Tennysons.

Debuts

 * Kenny Tennyson
 * Devlin Levin
 * Kevin 11,000

Characters

 * Kenny Tennyson (Main character of this episode)
 * Ben 10,000
 * Gwen Tennyson
 * Max Tennyson
 * Ken's friends (Billy Alien, another unnamed alien kid)
 * Gwendolyn Tennyson (Kenny's sister)

Villains

 * Kevin Levin (True villain of this episode)
 * Devlin Levin (Temporarily)
 * Vulkanus
 * Mot Snikrep
 * Sploot

Aliens Used

 * Fourarms (x4)
 * XLR8 (x6)
 * Cannonbolt (x2)
 * Heatblast
 * Diamondhead (x2)
 * Spitter(x2
 * Articguana
 * Benmummy
 * Way Big
 * Buzzshock (x2)
 * Wildvine
 * Grey Matter (x2)
 * Ditto

Errors

 * Though the party is for Kenny's 10th birthday, his cake is erroneously depicted with 11 candles.
 * When Kenny was fighting Kevin, the Omnitrix timed out even though he had unlocked the limiter.
 * When Kevin is seen on top of the Null Void containment unit, he had white lines as a design on his shoes. After that, his shoes are completely black.
 * When Kevin 11,000 is in his mutant form, sometimes his toes are red, other times they're black.

Trivia

 * At the birthday party for Kenny, one of his alien friends looks like the character of 'Billy' from The Grim Adventures of Billy and Mandy. To drive the point home, he has the same voice actor as Billy.
 * Because of Paradox's explanation in the episode Ben 10,000 Returns, Ken 10 is now a canon episode however this episode only takes place in an alternate timeline.
 * At the end of the episode, Ben asks Devlin if he wants to move in with him, much like he did with his father Kevin in Kevin 11. Unlike his father, Devlin accepts.
 * This is the only episode of the original Ben 10 series that doesn't feature young Ben and Gwen.
 * This episode marks the first instance of the Omnitrix being used as a communicator. This feature isn't seen again until the sequel series.
 * Kevin 11,000 (in human form) resembles Van Kleiss from Generator Rex, another Man of Action series.