Alien X

Alien X's History

Alien Force

Alien X first appeared in X = Ben + 2, where he stopped a flood caused by a broken dam. After much fruitless arguing, Ben convinces Serena and Bellicus to transform him into another alien (mostly by insulting them). Ben swore that he won't use Alien X again, as it is not worth the price.

The same scene reoccured in a flashback in The Ultimate Enemy: Part 2.

Ultimate Alien

In The Forge of Creation, Ben half-heartedly turned into Alien X in hopes of learning the location of the Forge of Creation from Bellicus and Serena. However, they start debating about other things as usual when Professor Paradox suddenly appears, putting himself in danger by going into the presence of Bellicus and Serena, who almost voted to destroy Paradox because he is not allowed to be within 500 light-years of a Celestialsapien. Paradox reverted Alien X back into Ben before the two personalities could come to a vote.

Omniverse

In So Long, and Thanks for All the Smoothies, Alien X was unable to stop the Annihilargh from destroying the universe. Fortunately, Ben managed to convince Bellicus and Serena to recreate a near-identical copy.

In Universe vs. Tennyson, Alien X defeated the Galactic Gladiator, winning the trial for recreating the universe.

In Weapon XI: Part 1, Alien X battled the Rooters and the brainwashed Amalgam Kids.

In A New Dawn, Skurd used Alien X's DNA to create a sword for Chromastone, which managed to pierce the Annihilargh's barrier. Later, Alien X appeared for a short time when Ben was cycling through his aliens.

Alternate Timeline

In Ben 10,000 Returns, Negative Alien X was mentioned by Professor Paradox, where, in an alternate timeline, Albedo turned into said transformation and was trapped motionless for nearly a year.