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These are the mutations Kevin suffered in 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 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 of his sanity, as he spared an opposing Gwen. Either way, Kevin was too powerful for anyone to beat and Ben thought "putting him down" was the best option.
In Absolute Power, Kevin's self-control is almost entirely overtaken by his insanity. His Osmosian 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.
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 power to their rightful owners as well as reviving the five Andromeda Aliens.
In Night of the Living Nightmare, Ultimate Kevin appeared in a dream, trying to convince Ben to surrender the Ultimatrix.
- Kevin Levin: Hair, clothing
- Big Chill: Wings, hood
- Brainstorm: Two legs in place of lower left arm, right hand
- Chromastone: Right shoulder crystals
- Diamondhead: Right arm structure
- Four Arms/Manny Armstrong: Torso, body shape, arm count
- Goop: Body structure
- Humungousaur: Torso, chest plates, tail
- Ultimate Humungousaur: Face, right eye
- Jetray: Face, skin, right foot
- Echo Echo: Inner mouth
- Lodestar: Left shoulder spike
- Rath: Upper left arm, left foot, left wrist claw
- Spidermonkey: Lower right arm, arm count
- Ultimate Spidermonkey: Lower jaw
- Swampfire: Left arm structure
- Water Hazard/Bivalvan: Water ports
Powers and Abilities
Kevin has his own and the abilities of all the aliens of Ben Tennyson. Here's the list of the abilities that are shown.
- Kevin Levin: Power absorption
- Viktor: Electrokinesis
- Alan Albright/Heatblast: Pyrokinesis, fire breath
- Helen Wheels/XLR8: Enhanced speed
- AmpFibian/Ra'ad: Electrokinesis, flight, electric absorption
- Armodrillo/Andreas: Earth Eruption, Tremor, Jackhammer Arms, Enhanced Strength
- Big Chill: Flight, ice breath, intangibility
- Brainstorm: Electrokinesis, electric force fields
- Chromastone: Ultraviolet beams, energy absorption
- Diamondhead: Shapeshifting arm, Crystal Projectiles
- Echo Echo: Sonic Screams
- Four Arms/Manny Armstrong: Enhanced Strength, Enhanced Durability, Enhanced Jumping; Increased Arms
- Goop: Liquefaction, Elasticity
- Humungousaur: Enhanced Strength, Enhanced Durability
- Ultimate Humungousaur: Enhanced Strength, Enhanced Durability
- Jetray: Neuroshock Blasts, Space Survivability
- Lodestar: Magnetism, Ferrokinesis
- NRG/P'andor: Radioactive Blasts, Nuclear Optic Blasts
- Rath: Wrist Claw
- Ultimate Spidermonkey: Web Spiting
- Spidermonkey: Enhanced Agility
- Swampfire: Flame Projection, Chlorokinesis
- Terraspin/Galapagus: Aerokinesis
- Heatblast/Alan Albright: Pyrokinesis
- Water Hazard/Bivalvan: Hydrokinesis
- Ultimate Aggregor: Jackhammer Arm, Enhanced Durability, Hydrokinesis, Energy Blasts, Electrokinesis, Flight, Space Survivability, Aerokinesis
- Gwen Tennyson and Stone Creatures: Mana manipulation
He is shown to be vulnerable to Gwen's mana attacks.
He can easily be defeated by Ultimate Echo Echo's sonic attacks.
Ben 10: Ultimate Alien
- The Forge of Creation (first appearance)
- ...Nor Iron Bars a Cage
- The Enemy of My Enemy
- Absolute Power: Part 1
- Absolute Power: Part 2
- Night of the Living Nightmare (dream)
- The Ultimate Enemy: Part 2 (flashback; cameo)