Ultimate Ben

Ultimate Ben is the evolved form of Ben Tennyson.

Appearance
Ultimate Ben's appearance does not change. Instead, the Omnitrix/Ultimatrix face is set on the center of his chest with the four prongs that symbolize the evolution fuction 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 fit Ultimate Humungousaur's powers.

Seen briefly, after Ben reverted back from Ultimate Spidermonkey in Fame, Ben's eyes glow pink for a moment. Dwayne hinted that the pink eyes Ben displayed are part of Ultimate Ben.

It is not known whether Ultimate Ben is able to use Alien X's powers successfully.