The Grim Adventures of Billy and Mandy Wiki
Modern Primitives
Modern Primitives.png
Series The Grim Adventures of Billy & Mandy
Season 5
Production code 606
Broadcast information
Cartoon Network US Premiere January 27, 2006
Paired with Giant Billy And Mandy All-Out Attack
Chronological information
Major Cheese
Giant Billy And Mandy All-Out Attack

Modern Primitives is the 6th episode from season 5 of The Grim Adventures of Billy & Mandy. It is a crossover episode with Fred Flintstone from The Flintstones.


Billy finds a caveman (which is none other than Fred Flintstone from The Flintstones) while trying to dig up the center of the earth so he can live there because the surface is cold. Fred is so overwhelmed by the modern world that he goes berserk and kidnaps the teacher, so it's up to Billy and the gang to save her from him.


  • Story by: Maxwell Atoms and Alex Almaguer
  • Storyboard by: Alex Almaguer
  • Directed by: Shaun Cashman


  • Mandy: Well, he's trying anyway.
  • Both: (Chewing the Ribs)
  • Harold: (Burps)
  • Billy: (Growls)



  • Barney and Betty Rubble appeared in the credits.
  • Fred Flintstone, doesn't speak (except he says his own name while introducing himself to Billy) in this episode but only grumbles and says his famous line, "Yabba Dabba Doo!" (Sometimes “Yabba Dabba!”)
  • This is currently the only time James Arnold Taylor has voiced Fred outside of commercials and promos.