Season
Season 7 Episode
- Season 1 Meet the Reaper
- Season 1 Skeletons in the Water Closet
- Season 1 Opposite Day
- Season 1 Look Alive!
- Season 1 Mortal Dilemma
- Season 1 Get Out of My Head!
- Season 1 Fiend Is Like Friend Without the 'R'
- Season 1 Recipe for Disaster
- Season 1 A Dumb Wish
- Season 1 Grim vs. Mom
- Season 1 Tastes Like Chicken
- Season 1 Grim or Gregory?
- Season 1 Something Stupid This Way Comes
- Season 1 A Grim Surprise
- Season 1 Beasts and Barbarians
- Season 1 Hoss Delgado: Spectral Exterminator
- Season 1 To Eris Human
- Season 1 Billy's Growth Spurt
- Season 1 Billy & the Bully
- Season 1 Big Trouble in Billy's Basement
- Season 1 Tickle Me Mandy
- Season 1 Little Rock of Horrors
- Season 1 Dream a Little Dream
The Grim Adventures of Billy and Mandy - Season 1 Episode 20 Big Trouble in Billy's Basement
8.10 11 minutes 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.
