Alien X is a Celestialsapien alien from Zvezda. (This is not the Forge of Creation, as confirmed by Dwayne McDuffie. Celestialsapiens are only born in the Forge.)
Ben is afraid that Alien X might be too powerful, and only uses him in dire situations. Alien X is capable of warping reality at will. He has a black body covered with tiny w
stars, white hands and feet, green eyes, and three horns protruding from his head. Alien X possesses three distinct personalities: Serena, the voice of love and compassion, Bellicus, the voice of rage and aggression, and Ben, the voice of reason.
In order for Alien X to perform any action, including but not limited to, simple movement and transforming back into Ben, at least two of the three personalities (Serena, Bellicus, or Ben) must agree to do so. This reveals to be a major weakness, as the personalities initially weren't even interested in dealing with present affairs and wanted to finish some past ones that weren't possible to deal with without Ben (with a comical scene where Bellicus reopens a discussion on whether or not to save the dinosaurs from extinction).
Alien Z is Ultimate Alien X. He has the same overall appearance. But in Alien Z's case, he has a white body studded with little black stars. He also has the same reality warping powers as Alien X, but he is not held back by Serena or Bellicus.
As opposed to hissparing canon appearances, Alien X appeared five times, once being without the need for Bellicus and Serena. He was one of four aliens stolen by Darkstar inBen 10: Invasion of the Omnitrix, and retrieved in Darkstar Falling.
Alien X is unlocked when the Omnitrix resets after defeating the Highbreed. He is usually used only as a last resort, but is not always successfully used.
In Richard's A Christmas Carol, Alien X portrays the second form of the Ghost of Christmas Yet to Come. He changes from the first form when showing Scrooge the Kratchit family's future. He shows Scrooge the grave of himself.
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