Adventure Time (2010)

S2E24 Mortal Folly

The Lich escapes from its amber confinement within Princess Bubblegum's Castle, prompting Finn and Jake to spring into action to prevent it from regaining its strength. Amidst their urgent quest, they are continually interrupted by the Ice King, who is desperate for their approval to propose to Princess Bubblegum. As they juggle battling a powerful foe and dealing with the Ice King's relentless pleas, Finn and Jake must find a way to restore peace before it's too late.