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.

Aside from his main powers, Ultimate Ben also has complete access to his own dormant magical and Anodite powers, though he says this is from spending 20 years with one. (That he may know a lot more than he lets on may mean that Ultimate Ben has many more abilities and powers than his aliens from the Ultimatrix. )

Aliens Accesed as Ultimate Ben

 * Ultimate Humongousaur
 * Articguana
 * Heatblast
 * Clockwork
 * Spidermonkey
 * 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 special abilities from this single form.
 * The abilities he attained while in his Ultimate Human form to gain abilities without changing refers to human adaptability, as it is said to be an ability that exceeds all special and unique abilities and powers of all alien species.[1]
 * Ben 10,000 refers to how it is his "best transformation." This is ironic because the present Ben doesn't like his Ultimates.
 * Ben 10,000 said that young Ben will figure out all of his Ultimate Human abilities someday.
 * It was seen briefly in the episode Fame, after Ben reverted back from Spidermonkey, that Ben's eyes glowed bright pink for one brief moment. Dwayne McDuffie has hinted that the glowing bright pink eyes Ben had displayed after transforming back from his first time transforming into Ultimate Spidermonkey are part of the human ultimate form.
 * 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 with the ultimatrix sign on his chest.