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I’ve had it with you, Tennyson! Always beating me when we were kids! I get turned into a freak, you become a world famous superhero! Ultimate Kevin is the mutation Kevin Levin went through in Ultimate Alien. Ultimate Kevin was composed of a larger pool of aliens than his earlier mutations, with multiple parts of his body now being combinations of multiple aliens. Ultimate Kevin wore Kevin’s pants, albeit with tears at the edge of the legs. Somewhere deep down he’s still our friend.

No, lovely Gwen, he’s not your friend anymore. He’s an empty shell, knowing only a hunger that must be fed. Ultimate Kevin’s personality became even worse than Kevin 11 was in the original series. Fortunately, Kevin still seems to have some control of his sanity, as he spared an opposing Gwen. Ultimate Kevin’s feelings for Gwen prior to his mutation became mixed with his insanity, as seen when he commenting that he thinks she has deliberately avoided him. He also shows anger when Cooper tries to get in his way and tries to kill him as well. Ultimately, despite his love for Gwen, Ultimate Kevin was overwhelmed by his hunger and nearly killed her.

By Absolute Power: Part 1, Ultimate Kevin’s self-control is almost entirely overtaken by his insanity, further cementing Ben’s claim that Kevin was too powerful for anyone to beat and that “putting him down” was the best option. In Nor Iron Bars a Cage, Ultimate Kevin returned to the Null Void to avenge his former mentor Kwarrel by killing Morgg. However, he simply left when Ben and Gwen intervened and Morgg was brought to justice. In The Enemy of My Enemy, Ultimate Kevin goes rampant on attacking Argit for all his double-crossing.

Fortunately, Argit’s ability to turn off his pulse confused Ultimate Kevin into leaving the Plumbers’ Academy. In Absolute Power: Part 1, Ultimate Kevin’s instincts have caused him to develop 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. Ultimate Kevin admits to Gwen that he retained a single shred of his humanity, which was enough to 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. Overwhelmed by his hunger, he then becomes obsessed with her life force and powers and ends up tracking her. Ultimate Kevin was cured in Absolute Power: Part 2, thanks to the efforts of Ben, Gwen, Cooper, and Darkstar. In Night of the Living Nightmare, Ultimate Kevin appeared in a dream, trying to convince Ben to surrender the Ultimatrix.

However, he was quickly defeated and reverted back to normal when Ben transformed into Ampfibian and electrocuted him. In The Ultimate Enemy: Part 2, Ultimate Kevin appeared in a flashback. Overall, Ultimate Kevin had access to the abilities of every normal and Ultimate alien Ben had in the Ultimatrix during the second season of Ultimate Alien. Ultimate Kevin still retained his normal counterpart’s absorption abilities, being able to absorb powers, energy, and matter. Eventually, he even became able to absorb power from a close distance away.

Ultimate Kevin had a degree of enhanced agility, through the combination of his Aerophibian, Arachnichimp, and Kineceleran DNA. Both Ultimate Kevin’s flight and intangibility primarily came from Big Chill, the former by using his wings. Ultimate Kevin was able to morph his Petrosapien arm to create weapons or tools such as a pickaxe, as well as using it to fire crystal projectiles. Out of the portholes on his hands, Ultimate Kevin could shoot out jets of water or fire blasts, which came from Water Hazard and Swampfire, respectively. After absorbing Alan Albright’s Pyronite powers, his fire manipulation and resistance to fire both grew stronger.