Vilgax
Vilgax is an intergalactic alien warlord and conqueror, a Chimera Sui Generis who serves as Ben's archenemy, and the most recurring villain in the ongoing franchise, having appeared multiple times in every series. Ben considers him as one of the most dangerous villains he has faced.
Vilgax was the main antagonist of Ben 10, Season 2 of Alien Force, and Season 3 of Ultimate Alien.read more