The Grim Adventures of Billy and Mandy (2001)

Episode Overview

Feeling completely unamused, Billy and Mandy are taken by Grim to the Underworld's "Circus of Terror." The show's ringleader, Dr. Fear, spots the duo and attempts to enlist them to draw in an audience eager to see real humans perform. Once back home, Dr. Fear manages to kidnap them, prompting Grim to rescue his friends. During the chaotic performance, Mandy manages to escape and unveils an unexpected twist: the beastmaster, Clortho, is none other than Dr. Fear himself, who turns out to be just a simple earthworm, leaving Billy baffled.