Although no explanation is given for his return or change in powers, Kevin Ethan Levin returns as a 16-year old teenager in Ben 10: Alien Force. Originally an antagonist, he is first seen brokering an illegal weapons deal with the Forever Knights. It is later revealed that he is acting as a middle-man for the DNAliens, who are disguising themselves as humans, providing vastly superior 'Level 5' weapons. The weapons deal is interrupted by Ben Tennyson, appearing as the alien Swampfire. After being captured by Ben, Kevin reluctantly agrees to help Ben and Gwen on their quest to find the missing Max Tennyson - although he does so simply so he can be paid. His middle name is revealed to be Ethan, in Cartoon Network Action Pack Issue #27. His full name is Kevin Ethan Levin.

Although he is somewhat unwilling to do much in the way of helping, he is not against the idea of fighting against the DNAliens. His tendencies toward violence keep him fighting alongside Ben and Gwen, but he is still reluctant on further investigating. When Magister dies due to a tear in his containment suit, Kevin is convinced to join on full time in assisting Ben and Gwen, as repayment for the alien saving his life.

Although he has signed up full time in assisting the Tennysons, his personality is aggressive and distrustful as ever. He is not above approaching situations in the most violent way possible, and has no predisposition about launching himself headlong into situations with fists flying. This has caused him trouble in a number of situations; most notably in the episode "Paradox", when he is turned into an old man for trying to punch a time/space anomaly, and in the episode "The Gauntlet", where he attempts to start a fight with an alien gauntlet enhanced Cash, and is promptly beaten.

Kevin shows a romantic interest in Gwen Tennyson, often going out of his way to talk with her and try to show interest and concern for her. He steps in when Ben and Gwen argue, has promised to follow Gwen 'anywhere', and has tried to step in many times in her defense while fighting. He has not, and does not seem willing to, openly admit these feelings to Gwen. Despite this, however, the two are often seen traveling together, as if they were dating.

n "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 but it may have only been an exaggeration on his part, since it is slightly hinted that Kevin's mother remarried, due to him saying, "My father, my real father". It's is also possible that he had somehow ended up it foster care, and that it was these parents that left him. At the end of the same episode, Kevin, along with Gwen and Ben become 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. 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. Most likely because of Gwen's extreme unbeatable hotness)

In the season 3 premeire "Vengence of Vilgax", Kevin is subjected to feedback from the Omnitrix after Ben tampers with it. Because of this, he is unable to revert back to his normal human form, instead becoming a mixture of different elements. It is unknown if this made his body become a mixture of the elements he has absorbed or if this fused the materials around him to his body, though it's most likely the former.

Alternate Versions of Kevin Levin

Old Man

see Old Man Kevin.

Abilities
Kevin's abilities have changed drastically since his last appearance. He no longer has the abilities of Ben's previous omnitrix aliens, and shows no capability of draining or manipulating energy. Instead, he now has the ability to 'absorb' matter and form an armored "skin", temporarily gaining it's properties. These powers are only superficial, however - although he is able to form a layer of whatever he absorbs around his person, sufficiently powerful attacks are able to shatter this outer laying, exposing his body beneath. In season 3 Kevin loses the ability to revert to his human form after a feedback blast, caused when Ben tampers with the Omnitrix, imprints various materials onto him, such as concrete, metal, wood, what appear to be Diamondhead crystals or quite possibly Taedenite crytals from "Kevin's Big Score". in addition,Kevingains limited shapeshifting abilites, seen when he shifts his hands into a variety different tools, such as a mace and large clippers.

Some of the substances he has absorbed include:

• His car
• Ben's bedroom door
• A segment of the Road
• Train tracks
• Crow bar
• A piece of stone pathway (outside Gwen's House)
• Rocks
• Coins
• Mike Morningstar's door knob
• Wall Section (Possible Brick or Cement) and Steel Support Rods (in "The Gauntlet" )
• Taedenite (See Taedenite Kevin Levin)
• Sevenseven's Armor
• His car's tires

Equipment
Kevin seems to have a tendency to 'collect' trophies and trinkets from his various encounters; he attempts to smuggle a Level 5 weapon in "Ben 10 Returns (Part 2)", and he takes the alien gauntlet from the defeated robot in "The Gauntlet".

Two pieces of 'permanent' equipment available to Kevin are his green and black striped muscle car (which was replaced once by Paradox in the episode "Paradox"), and the Plumber's Badge belonging to Magister. He has also built alien tech into his car every time he gets the chance.

See also: Kevin 11Quotes, Kevin 11, Images

First Appearance

Ben 10 Returns Part 1