Finn and Jake chase the Lich through a dimensional portal where they meet Prismo, who tells them that the Lich wished for the extinction of all life. This leads Finn to wish that the Lich "never even ever existed.
Finn attempts to prove to Jake that Flame Princess isn't evil while trying to win her heart turns into a quest to stop her from taking over the Goblin Kingdom.
The show follows the misadventures of the infamous Black Hat, a vulgar and sharply dressed narcissistic inhuman fiend who does his part to make the world a little more vile and its heroes a little more dead. Aiding him (with varying degrees of consent) are his cohorts, meek scientist Dr. Flug, the neurotic and adorably failed bestial genetic experiment 5.0.5, and his biggest (and most violently deranged) fan-girl Demencia. Written by Cameron Iacono