Alien X, Ben 10 List Wiki

Alien X, known as Transformation 10 by the Ultimatrix, is the Codon Stream/Omnitrix's DNA sample of a Celestialsapien from the Forge of Creation. Alien X's DNA was obtained sometime prior to Alien Force. In Ben 10 Returns: Part 1, Alien X was unlocked by the prototype Omnitrix's Recalibration Mode. After using Alien X in X = Ben + 2, Ben decided that Alien X was too risky to use due to Bellicus and Serena. Sometime between The Final Battle: Part 2 and The Forge of Creation, Ben had Kevin install

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Is Alien X outversal since he lives in the forge of creation which is outside the omnieverse and is not affected by dimensions? - Quora