The Grim Adventures of Billy and Mandy Wiki
The Grim Adventures of Billy and Mandy Wiki
Billy & Mandy Begins
Billy & Mandy Begins.png
Series The Grim Adventures of Billy & Mandy
Season 5
Production code 513
Writer Jeff Prezenkowski

Mike Diederich Maxwell Atoms Antonie Guilbaud

Broadcast information
Broadcast number 13B
Cartoon Network US Premiere August 9, 2006
Paired with The Crass Unicorn
Chronological information
The Crass Unicorn
Everything Breaks

Billy & Mandy Begins is the second segment from the sixty fifth episode of The Grim Adventures of Billy & Mandy.


As Billy, Mandy, Grim, and Irwin hang from a rope about to be eaten by a giant sea serpent, Irwin wonders how they came into that trouble. Billy and Grim each tell separate stories on how they originally became best friends forever and ever. Billy's fantastic story is about him and Mandy being space patrol officers who collect the Grim Reaper's bones, cloak, and skull to summon him; Grim tells a story on how the evil Mandy and his pet servant Billy managed to capture him inside a containment unit (parodying the Ghostbusters' ghost traps). Mandy quickly tells the real story during a montage of clips from the pilot (though Grim denies it), before the four are swallowed whole by the serpent.


  • Story by: Jeff Prezenkowski & Mike Diederich & Maxwell Atoms & Antonie Guilbaud
  • Storyboard by: Maxwell Atoms & Mike Diederich & Antonie Guilbaud
  • Directed by: Juli Hashiguchi


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The image gallery for Billy & Mandy Begins may be viewed here.


  • Shmoo makes a cameo appearance.
  • Irwin mentions his brother, Melvin, which would indicate that he's still around, even though he accidentally killed him in "The Halls of Time".
  • When Mandy tells the real flashback, she incorrectly states that Mr. Snuggles was seven years old at the time when he was actually ten.