Ultimate Ben

Ultimate Ben is the evolved form of Ben Tennyson.

Appearance
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 the evolution function 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.

Trivia

 * Ben 10,000 considers this to be his best transformation.