Vilgax (voiced Steven Blum) is Ben Tennyson's arch enemy and the main antagonist of the Ben 10 series. His goal is to take the Omnitrix and control the universe.
- Vilgax will become Twilight's enemy in Twilight meets Ben 10.
- Vilgax will return for revenge in Twilight's Adventures of Ben 10: Secret of the Omnitrix.
- Vilgax will appear again in Twilight's Adventures of Ben 10: Alien Force.
- Vilgax will appear once again in Twilight's Adventures of Ben 10: Ultimate Alien, and after that, he will join the Heylin Empire as part of Anubis and Adagio's right-hand man as well as part of Twilight and the Rainbooms' powerful foes.
- Vilgax will return again in Twilight's Adventures of Kung Fu Panda 2.
- Vilgax will become Jeffrey and Jaden's enemy in Jeffrey, Jaden & Friends meet Ben 10.
- Vilgax will return for revenge (and face Hiccup for the first time) in Jeffrey, Jaden, Hiccup & Friends go to Gravity Falls - Weirdmageddon Part 1.
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