Season
Season 7 Episode
- Season 4 The Secret Snake Club
- Season 4 He's Not Dead, He's My Mascot
- Season 4 Hog Wild
- Season 4 The Bad News Ghouls
- Season 4 The House of No Tomorrow
- Season 4 Happy Huggy Stuffy Bears
- Season 4 The Secret Decoder Ring
- Season 4 Wild Parts
- Season 4 The Problem with Billy
- Season 4 Wishbones
- Season 4 Dream Mutt
- Season 4 Scythe for Sale
- Season 4 Jeffy's Web
- Season 4 Irwin Gets a Clue
- Season 4 Duck!
- Season 4 Aren't You Chupacabra to See Me?
- Season 4 Zip Your Fly
- Season 4 Puddle Jumping
- Season 4 Runaway Pants
- Season 4 Scythe 2.0
- Season 4 The Firebird Sweet
- Season 4 The Bubble with Billy
- Season 4 Billy Idiot
- Season 4 Home of the Ancients
The Grim Adventures of Billy and Mandy - Season 4 Episode 19 Runaway Pants
8.00 11 minutes At school it is time for the "Presidents Fitness Test", but Billy is absolutely unfit for exercise. On the other hand, Nergal Junior uses his shape-shifting powers to become fit at will and excel in every test. Billy asks Junior to transform into a pair of pants that he can wear, so he can run fast and win the 50-meter race. Since Junior has never attempted to transform into inanimate objects he cannot stop running and cannot revert to his human form. Billy keeps running forever while he becomes a national sensation known as the "Fitness Lad". It is revealed that the story was just all a fabrication created by the narrator, who parodies The Twilight Zone.
