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Big Trouble in Billy's Basement

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Big Trouble in Billy's Basement
Series The Grim Adventures of Billy & Mandy
Grim & Evil
Season 1
Production code 120
Writer Gord Zajac
Broadcast information
Broadcast number 20
Cartoon Network US Premiere October 11, 2002
Paired with Tickle Me Mandy
Chronological information
Billy & the Bully
Tickle Me Mandy
Big Trouble in Billy's Basement is the twentieth episode of The Grim Adventures of Billy & Mandy. It was originally part of a Grim & Evil episode.


Billy opens a strange book, The Bad Book, that makes him become possessed by the minion of an ancient cosmic entity, Yog-Sothoth, who wishes to open a portal for his master to enter and destroy the planet. Grim and Mandy manage to get Hoss Delgado to exorcise the spirit, but Billy creates an evil portal in the basement where Yog-Sothoth will enter the world. In the end, Yog-Sothoth and The Old Ones kick Billy out of The Dreamlands because they didn't enjoy his presence.

Credits Edit

  • Story by: Gord Zajac
  • Storyboard by: Chris McCulloch
  • Directed by: Robert Alvarez, John McIntyre


Big Trouble in Billy's Basement/Transcript


  • When Billy gets possessed by Yog's minion, his voice changes so that he sounds just like Zim from Invader Zim. Even his laughter becomes exactly like Zim's. Both characters are voiced by the same person.
  • The title "Big Trouble in Billy's Basement" is a parody of the movie title "Big Trouble in Little China".


The image gallery for Big Trouble in Billy's Basement may be viewed here.

Billy & The Bully
Grim & Evil Episodes Next:
Christmas Con Carne

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