Alien X is the Ultimatrix's DNA sample of a Celestialsapien from the Forge of Creation.
Alien X is a humanoid alien that has white hands. He is all black excluding his hands, which are white. He has tiny white star-like spots all over his body. His eyes are green with no pupils. On his head are 3 horns. Unlike most of Ben's aliens, Alien X has five fingers. Alien X wears the Omnitrix/Ultimatrix symbol on his chest.
Powers and AbilitiesEdit
Alien X is omnipotent, able to warp reality, time, space to any level he wishes. This makes him Ben's most powerful form.
In order for Alien X to perform any action, including simple movement and transforming back, at least two of his personalities must agree to do so. This has proven to be a major weakness, as Serena and Bellicus weren't interested in dealing with present affairs and wanted to finish past ones that weren't possible to deal with without Ben.
In Ben 10,000 Returns, the said weakness was referenced by Paradox, where he revealed that there is an alternate timeline where Albedo transformed into Negative Alien X and was stuck motionless for nearly a year.
- Karakura Battle Part III (story debut)
(It is possible that Alien X will make a future appearance)