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Power, weakness. Imagine a Power so great that once exerted it would leave you completely weak. Alien X is coming.

Alien X is the Omnitrix's DNA sample of a Celestialsapien from the Forge of Creation, Alien X first appearr in Ben 10: Alien Force, X = Ben + 2. 

He was voiced by Yuri Lowenthal, who also voiced Spider-Man in Marvel's Spider-Man video game.


Alien X is a completely solid black humanoid alien with white star-like spots all over his body, He has white hands with four fingers and a thumb on ease one, three horns on his head. He has green eyes and has the Omnitrix symbol on his chest.

In Omniverse, Alien X looks almost the same, but with a few minor changes. His body is more muscular than before, His chin is bigger while his horns are smaller and the spots on his body are now brighter. His Omnitrix symbol remain on his chest.


Ben 10: Alien Force

Alien X first appears in X = Ben + 2, when Ben Tennyson first used Alien X to repair a the broken dam by locally reversing time within that area. After that, Alien X remained entirely motionless during the rest of the episode, Due to Ben having an everlasting argument with Alien X's two personalities named Serena (the voice of love and compassion) and Bellicus (the voice of rage and aggression). Ben manages to convince the two personalities to transform into another alien form (Swampfire). After what happened, Ben decided to never use Alien X ever again, thus making his most powerful transformation unusable.

Ben 10: Ultimate Alien

It is revealed prior to The Forge of Creation, that Kevin Levin built a security system into the Ultimatrix to prevent Ben from accidentally transforming into Alien X at any point in time, or to stop anyone else if they had somehow gained access to the Ultimatrix. Gwen and Kevin used two keys that inserted into the sides of the core to unlock Alien X, so Ben could hopefully use him to locate the Forge of Creation and defeat Aggregor. However, Ben was still unable to convince Serena and Bellicus, so Professor Paradox reverted Alien X back into Ben.

Ben 10: Omniverse

In "So Long, and Thanks for All the Smoothies", Alien X was unable to stop the Annihilargh from destroying the universe. This resulted in everything being lost, but ben had managed to convince his personalities to recreate the Universe, with some minor differences such as the Mr. Smoothy logo changing and Ben now wearing a white and green jacket.

In "Universe vs. Tennyson", Alien X defeated the Galactic Gladiator, winning the trial and preventing the second death of 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.

Powers and Abilities

  • Nigh-Omnipotence: It is widely believed that Alien X "can do anything".
    • Reality Warping: Alien X can manipulate reality, but a thought. He used this ability to put a dam (and the water) back together in a fashion similar to reversing time itself.
      • Duplication: In his fight with the Galactic Gladiator, Alien X was able to create dozens of copies of himself.
      • Shapeshifting: After using the above power, Alien X was able to morph all these clones into a pseudo-black hole/galaxy which he used to defeat the Galactic Gladiator.
      • Telekinesis: Alien X used this ability against the Rooters; Alien X had full control over their bodies and was able to make them shoot each other.
      • Energy Manipulation: When Leander tried to harm him with a radioactive energy blast, Alien X merely put up his hand at sent the blast to destroy the Rooter Base.
    • Godlike Condition: Alien X tanked a universe-destroying explosion without a scratch and was easily able to create a nigh-perfect copy of the universe.
      • Celestial Body: The specks on Alien X's body are galaxies which were used to recreate the universe.
      • Absolute Sense: While not exactly 'absolute', Paradox claims that Celestialsapiens (Alien X's species) can sense him from 500 light years away.
      • Cosmic Speed: In his fight with the Galactic Gladiator, Alien X was able to travel from galaxy to galaxy in seconds.
      • Invulnerability: Alien X wasn't harmed at all during his fight with the Galactic Gladiator.
      • Enhanced Strength: Alien X was easily able to punch the Galactic Gladiator into a moon.


  • In order for Alien X to do ANY action, at least 2 out of the 3 personalities inside Alien X must agree, however this weakness disappeared in Omniverse.  Proof 
  • Alien X can be harmed by other Celestialsapiens, but that damage can be easily restored.
  • Alien X is susceptible to having his powers absorbed by Osmosians or other DNA absorbing species.
  • Any actions Alien X does can be nullified by the actions of another Celestialsapien.


  • Alien X is the most powerful out of all Ben's aliens
  • Alien X has appeared in 6 episodes (Not counting The Ultimate Enemy: Part 2, Since he was only seen in a flashback from X = Ben + 2).
  • Alien X is one of the few aliens that Ben doesn't use very often, likely due to the risk of being stuck debating forever with Serena and Bellicus, as well as the responsibility that comes with its power.
    • However, Ben was able to finally have gain full control over Alien X ever since Universe Vs. Tennyson. But despite not being used often, there's a possibility he would use Alien X for emergencies.




           Ben 10 logo.png Heroes

Main Heroes
Ben Tennyson | Gwen Tennyson | Max Tennyson | Kevin Levin | Rook Blonko

Azmuth | Professor Paradox | Cooper Daniels | Manny Armstrong | Alan Albright | Helen Wheels | Pierce Wheels | Ester

Original Series Aliens
Heatblast | Four Arms | Diamondhead | Ripjaws | Upgrade | Ghostfreak | Stinkfly | Grey Matter | Wildmutt (Ultimate Wildmutt) | Cannonbolt (Ultimate Cannonbolt) | Wildvine | Upchuck | XLR8 | Ditto | Blitzwolfer | Snare-oh | Frankenstrike | Eye Guy | Way Big (Ultimate Way Big) | Spitter

Alien Force/Ultimate Alien Aliens
Swampfire (Ultimate Swampfire) | Humungousaur (Ultimate Humungousaur) | Spidermonkey (Ultimate Spidermonkey) | Echo Echo (Ultimate Echo Echo) | Big Chill (Ultimate Big Chill) | Chromastone | Brainstorm | Goop | Jetray | Alien X | Lodestar | Clockwork | Rath | Jury Rigg | Nanomech | Water Hazard | AmpFibian | Armodrillo | NRG | Terraspin | Fasttrack | Eatle | ChamAlien | Shocksquatch

Omniverse Aliens
Feedback | Gravattack | Bloxx | Kickin Hawk | The Worst | Gutrot | Atomix | Astrodactyl | Ball Weevil | Bullfrag | Crashhopper | Pesky Dust | Walkatrout | Mole-Stache | Toepick | Buzzshock | Arctiguana | Whampire

Reboot Series
Ben Tennyson | Gwen Tennyson | Max Tennyson | Kevin Levin

Reboot Series Aliens
Heatblast | Diamondhead | Four Arms | Grey Matter | XLR8 | Wildvine | Cannonbolt | Upgrade | Stinkfly | Rath | Humungousaur | Overflow | Gax | Shock Rock | Slapback | Jetray | Way Big | Goop

Fusion Aliens
Atomic-X | Amalgam Ben | Big Chuck | Crashocker | Diamond Matter | Fourmungousaur | Heat Jaws | Humungoopsaur | Stink Arms | Uprigg | XLRArmBlastDiamondHeat

Other Aliens
Bashmouth | Bootleg | Crystalfist | Dark Matter | Freezelizard | Hot Shot | Humungoraptor | Quad Smack | Rollaway | Rush | Skunkmoth | Techno-Bubble | Thornblade | Toolboxx | Undertow | Wreckingbolt

Other Omnitrix Users
Ben 23 | No Watch Ben | Gwen 10

Other Characters
Spellbinder | Tetrax Shard | Sir George | Driba | Blukic | Lucy Mann | Charmcaster | Luhley | Myaxx | Julie Yamamoto | Kai Green | Jimmy Jones | Ken Tennyson | Clyde Fife | Fistina | Reinrassic III | Kwarrel | Skurd | Devlin Levin | Zed | Baz-El | Ship