Wake Up / Escape From the Citadel Wake Up: Finn and Jake try to commit a cosmic crime to get into a multiverse prison called the Citadel, in which Finn's father is trapped. Revealing himself as a dream-based manifestation, Prismo (voiced by Kumail Nanjiani) offers to help them by instructing them to bring him the old man who dreamt him up so they can wake him up. However, having been in a comatose state since his previous plan was ruined, the Lich (voiced by Ron Perlman) beats the duo to the punch by waking up the old man and then killing him; the Citadel's guardian subsequently captures him. Escape From the Citadel: Hitching a ride on the Lich's crystalized prison, Jake and Finn find the latter's father Martin (voiced by Stephen Root), who is not what Finn expected, as they are forced to flee when the Lich destroys the Citadel while putting the prisoners under his control to begin his plan of destruction. While Finn and Jake are distracted with the Lich, Martin flees with Finn giving chase. In the ensuing chase, Finn's grass sword takes over his entire arm, causing Finn to lose it as Martin escapes. Despite this setback, the Lich is turned into a giant baby, who they leave with Tree Trunks and Mr. Pig.