Lich (Adventure Time)

 Lich, also known as the Lich King, is the overall main antagonist of Adventure Time. He is an entity of pure evil who escaped from his imprisonment and tried to bring extinction to all life during his first appearance. He serves as a minor antagonist in Season 1, the main antagonist of the Season 2 finale arc, a minor antagonist/Bigger Bad in Season 3, the main antagonist of Season 4 and the Season 5 premiere arc; a recurring antagonist of Season 6 and a recurring antagonist in Seasons 7 and 8.

He was voiced by Ron Perlman, who also played Slade, Xibalba, Warhok in Disney's Kim Possible, Stabbington Brothers, Nino, Fire Lord Sozin, and Dieter Reinhardt.