Ultimate Ben

Ultimate Ben is the evolved human form of Ben Tennyson. His appearance does not change despite evolving, but it enables Ben to use any alien's unique abilities and powers without needing to change his physical appearance.

Abilities
While in this form, Ben would just pronounce the name of any alien he chooses to transform to (though it is not necessary) or press the Ultimatrix symbol on his chest. While Ben's physical human appearance does not change, it changes depending on the size of his chosen alien, as seen where he accessed Ultimate Humungousaur's powers, where his body frame increased to fit the form.

Aliens Accesed as Ultimate Ben

 * Ultimate Humungousaur
 * Articguana
 * Heatblast
 * Clockwork
 * Spidermonkey
 * Big Chill
 * Jetray
 * XLR8
 * Diamondhead

Trivia

 * Ben says that he has not transformed into another alien for years since he discovered his Ultimate Ben form, the others having become unneeded since he can use all of their abilities from this single form.
 * The abilities he attained while in his Ultimate Ben form to gain abilities without changing refers to human adaptability, as it is said to be an ability that only humans possess.[1]
 * Ben 10,000 said that young Ben will figure out all of his Ultimate Ben abilities someday.
 * It is unknown if Ben can access Alien X's powers in this form and, if he can, whether or not he would have to deal with the two other personalities.
 * It is still unknown how Ben 10,000unlocked this form.
 * This is the only Ultimate form with no apparent changes, except for the Ultimatrix sign on his chest and when using an alien's ability with a larger bodyframe.