The Grim Adventures of Billy and Mandy — Season 1, Episode 20: Big Trouble in Billy's Basement
Animation, Comedy, Kids • 11 min • 7 seasons, 184 episodes • ★ 8.1/10
Episode synopsis
After taking the Underworld's "Bad Book" from Grim, Billy becomes possessed by an evil entity. Then, Billy steals Grim's scythe, and uses it to open a portal to summon Yog-Sothoth. In consequence, Mandy calls for Hoss Delgado to battle Billy. It is revealed that the portal can only be sealed by throwing the book into it. As Billy eats the book, Mandy throws Billy himself into the portal, restoring everything to normal. Instants later, a portal opens up and Billy comes out and says they didn't want him there.
About The Grim Adventures of Billy and Mandy
The exploits of the Grim Reaper, who has been forced into being the best friend of two children. A spin-off of the show Grim & Evil.