The Lich, also known as the Lich King, is the overall true 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 the 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, the main antagonist of the Season 5 premiere arc; the main, later tertiary antagonist of Season 6 and the recurring antagonist in Season 7.