The Grim Adventures of Billy and Mandy Season 4 Episode 19 Runaway Pants 2005
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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.
- Released: 2005-06-28
- Runtime: 11 minutes
- Genre: Animation, Comedy, Kids
- Stars: Greg Eagles, Richard Steven Horvitz, Grey DeLisle, Vanessa Marshall
- Director: Brian A. Miller, Gregory Hinde, Drew Neumann, Jay Bastian
