Grim & Evil — Season 1, Episode 20: Big Trouble in Billy's Basement
Animation, Comedy • 22 min • 5 seasons, 39 episodes • ★ 8.2/10
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 saying that they didn't want him there.
About Grim & Evil
Grim & Evil also known as Maxwell Atoms' Grim & Evil and promotionally referred to as The Grim & Evil Show, is an American animated television series created by Maxwell Atoms. The series, which debuted on Cartoon Network, consisted of two segments which were eventually spun off into their own series, The Grim Adventures of Billy & Mandy and Evil Con Carne.