When Aggregor goes after the limitless power of Alien X, Paradox steps in to stop him. Paradox tells Ben that he alone holds the key to stopping Aggregor from tapping into the unlimited powers of Alien X. Alien X is a Celestialsapien from the planet Zvezda, or maybe The Forge of Creation. He is an Omnitrix alien that appears in the show Ben 10: Alien Force and Ben 10: Ultimate Alien.  Episode 16 – Aired: 11/12/2010.