The Grim Adventures of Billy and Mandy (2001)

Episode Overview

Nergal, the infernal entity from the Earth’s core, rises to the surface along with a whimsical carnival, eager to forge friendships once more. Billy attempts to guide Nergal in social interactions, but his advice leads to misunderstandings. Upon discovering that Grim is bound to be a friend-slave to Billy and Mandy, Nergal decides to compel everyone to be his friends by transforming them into dark creatures like himself. Ultimately, Nergal manages to turn Billy, Mandy, Grim, and even the audience into one entity before the episode concludes.