|This article belongs to an alternate timeline or dimension within the Classic Continuity|
Kevin looks skinnier than his past self, and his hair is longer. He wears a black bodysuit.
Spending time in the Null Void has worsened Kevin's condition. He doesn't care about his own son Devlin or other innocent people being in harm's way.
Kevin managed to break out of the Null Void several times. During one of his breakouts he had a son, Devlin Levin with a woman from a Saturn colony. During his time in the Null Void, Kevin absorbed various aliens, making him able to turn into a new monstrous hybrid form far more powerful than the original, though he now seemingly has mastered his powers, as he is able to switch between this form and his human one at will and even access some of his alien powers in human form, including enhanced speed.
Ben's son, Ken, is celebrating his tenth birthday, and to commemorate the occasion Ben gives him an Omnitrix of his very own. However, he equips it with a limiter, unwilling to trust his son to defeat villains on his own. Ken soon befriends Kevin's son Devlin, and the same night Kevin 11 attacks. Unable to locate the Null Void projector, which Ben has moved after the events of Ben 10,000, he retreats.
Ken, also unaware of the move, endeavors to find it on his own, only to unwittingly lead Devlin right to it. Devlin releases his father from the Null Void, but is soon heartbroken to learn that Kevin's only interest is fighting Ben, not seeing his son and was kicked out of Kevin's family. Kevin is ultimately defeated by the combined forces of Ben, Ken, and Devlin. Just before that, Kevin 11,000 was shown to be at the mercy of Way Big, who had lost his temper when Kevin hurt Ken. He is then viciously crushed into the ground.
Although he appears to be knocked out cold, Kevin was barely damaged by Way Big, getting up with a couple cricks. He asks Ben if the assault was the best he had but Devlin manages to sneak up behind him and traps his father in a Null Void Egg, which he then gives to Max, who, before departing, says "I've got a special place for you this time!", indicating that Kevin will be imprisoned in a special high-security prison.
Powers and Abilities
After absorbing energy, Kevin can channel energy through his hands to manipulate technology, discharge it as energy blasts, or physically enhance his body to speed up cellular regeneration, increase his strength, or recover from injuries at an accelerated rate. However, the energy will dissipate over time or through excessive use, so he is required to recharge.
However, if Kevin absorbs energy, the energy will cause Kevin to become mentally unstable. Storing energy for long periods of time will worsen his instability. Energy absorption can sometimes easily turn into an addiction.
When Kevin has recently absorbed energy, he develops black marks around his eyes. This is a side effect of absorbing energy.
Similar to his ability to absorb energy, by absorbing the DNA, metabolism, and life force of other life forms, Kevin can use it as nourishment to sustain his health and strength. Absorbing all of someone's energy will kill them. Kevin can use the energy to acquire the creature's powers and undergoes mutation to accommodate the absorbed abilities.
Despite complete access to any of these absorbed abilities at anytime, they aren't as strong as their pure forms, as noticed by Diamondhead who estimated that they are only about 1/10 their full power, as seen when he was able to catch and crush Kevin 11's crystals with his bare hands while the others shattered upon hitting him.
In Ken 10, a 43-year-old Kevin escapes the Null Void with the help of his son, Devlin, and says that during his time there, he absorbed the power of other aliens trapped with him, 11,000 at least, becoming Kevin 11,000.
This mutant form does not have the same set-back as his first mutant form did due to him having mastered his absorbing powers and having absorbed all of the DNA and energy of the aliens and monsters he absorbed, including their life force. In addition, Kevin can now shift between his human and mutant form at will and retains certain powers in his human form, such as enhanced speed and enhanced strength.
He has show capable of the following abilities
- Kevin Levin: Energy Absorption
- Tetramand: Enhanced Strength
- Kineceleran: Enhanced Speed, Prehensile Tail
- Lepidopterran: Flight
- Petrosapien: Can shapeshift his right tentacle in a similar fashion to a Petrosapien
- Null Guardian: Tentacles
- Loboan: Sonic Howl
- Galvanic Mechamorph: Technopathy
- Unknown: Electrokinesis
- Unknown: Enhanced Durability
- Many other unseen abilities
All of the abilities he absorbed are only 1/10 their original strength, though he overcame this by having access to any of those powers at any time.
- Ken 10 (first appearance)