List of Ben 10 villains

Below is a list of all the villains who appear in the Ben 10 universe ranging from Ben 10, Ben 10: Alien Force, Ben 10: Ultimate Alien, Ben 10: Omniverse, and Ben 10 (Reboot). Each of the villains has been sorted into the TV series that he or she debuted in.

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Vilgax is a warlord who is Ben's first and most recurring nemesis through the series. Being of the Chimera Sui Generis (named after the mythological Chimera) race, who are able to turn into giant squid-like creatures when exposed to water, Vilgax was exiled from his home world for being ruthless, cruel, and power hungry. Soon after, Vilgax meets Maltruant as depicted in the Omniverse series finale which had him indirectly learn of the Omnitrix's existence when attacked by George Washington and a mysterious figure later revealed to be Ben. Since witnessing it, and after it is built years later, Vilgax became determined to have the Omnitrix and use it to build an army capable of conquering every planet in the galaxy. Other than that, establishing Vilgaxia as the center of his personal empire, Vilgax made himself infamously feared to the point of using Bioroids as his minions. But despite his cruel and villainous tendencies, Vilgax does care for his subjects' wellbeing and would do anything for their safety. Vilgax is also a self-proclaimed master of the Omnitrix, as he claimed that unlocking the Omnitrix's master control function was "child's play" for him, though Ben later learned to change Omnitrix's code sequence by the events of Alien Force.

In the beginning of the original series, Vilgax's attempt to get the Omnitrix from Xylene resulted with his body damaged and undergoing cybernetic enhancement while recuperating while he sent his robots and bounty hunters to find the item. Once his body is healed, with the added ability to increase his muscle mass, Vilgax began to go after Ben numerous times. Vilgax returns years later in the Ben 10: Alien Force episode "Vengeance of Vilgax", having conquered ten planets in order to take the powers and weapons of the champions from the conquered worlds as his own. His new abilities include even greater strength and invulnerability, a red laser projector, wind breath, flight at light-speed, super-hearing, a large sword he can cover with flame or Taydenite, and a gauntlet he can use to generate force fields and electric shocks. After taking Ultimos's powers while conquering his tenth planet, Vilgax arrives on Earth to challenge Ben. Instead, Vilgax ends up facing Max and the Plumber Helpers before Ben arrives and defeats him as Diamondhead. Though intergalactic law dictates him to leave Earth and never return, Vilgax continued to return to Earth a few more times to get his revenge.

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