|Species|| 3/4 Evolved Human|
|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 despite evolving, but he can use any alien's abilities and powers without needing to change his physical appearance.
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 can seemingly use different abilities from different aliens at the same time, as demonstrated when he landed the Rust Bucket with Ultimate Humongousaur's strength while using Jetray's flight ability.
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 fit Ultimate Humungousaur's powers.
Aliens Accessed as Ultimate Ben (Ben 10,000)
|Alien||Known Power(s) Gained||Unseen Power(s) Gained|
|Ultimate Humungousaur||Super 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||Super Speed (flying and swimming)|
|Able to go into Hyperspace|
|XLR8||Super Speed||Super Agility|
|Diamondhead||Diamond Generation||Energy Refraction and Redirection|
|Diamond Projectiles||Aging Immunity|
|Explosive Diamond Projecilles|