|The characters and/or events in the storyline depicted in this article have been changed, altered, added to, or erased from the main continuity.|
|Devolved Form||Ben Tennyson|
|Powers and abilities|
|Abilities|| Any powers of the Ultimatrix's aliens and Ultimates|
|Voice Actor||Sean Donnellan|
|First Appearance||Ben 10,000 Returns|
Ultimate Ben is the evolved form of Ben Tennyson.
Ultimate Ben's appearance does not change. Instead, the Ultimatrix face is set on the center of his chest with the four prongs that symbolize that the evolutionary function has been activated.
Powers and Abilities
Ultimate Ben pronounces the name of any alien he chooses (though it is not necessary) and presses the evolved Ultimatrix symbol on his chest to gain the powers of an alien that he chooses from his Ultimatrix.
Ultimate Ben's size changes depending on the size of his chosen alien, as seen where he accessed Ultimate Humungousaur's powers, Ultimate Ben's body frame increased to match Ultimate Humungousaur.
Aliens Accessed as Ultimate Ben (Ben 10,000)
|Alien||Known Power(s) Gained||Unseen Power(s) Gained|
|Ultimate Humungousaur||Enhanced Strength||Enhanced Durability|
|Articguana||Ice Breath||Cryo Immunity|
|Heatblast||Fire Blasts||Pyro Immunity|
|Clockwork||Time Rays||Time Travel|
|Spidermonkey||Enhanced Agility||Web Spinning|
|Big Chill||Ice Blasts||Ice Breath|
|Jetray||Flight||Enhanced Speed (flying and swimming)|
|Able to go into Hyperspace|
|XLR8||Enhanced Speed||Enhanced Agility|
|Diamondhead||Diamond Generation||Energy Refraction and Redirection|
|Diamond Projectiles||Aging Immunity|
|Explosive Diamond Projectiles|
- Ben 10,000 considers this to be his best transformation.