Writing Credits
| Doug TenNapel | ... | (video game: Earthworm Jim) |
| Doug Langdale | ... | (developed by) |
| Henry Gilroy | ... | (written by) |
Cast
| Charlie Adler | ... | Professor Monkey-For-A-Head (voice) | |
| Jeff Bennett | ... | Peter Puppy / Narrator / Billy's Dad (voice) | |
| Dan Castellaneta | ... | Earthworm Jim (voice) | |
| Jim Cummings | ... | Psy-Crow / Fur-Bearing Trout (voice) | |
| Edward Hibbert | ... | Evil the Cat (voice) | |
| Andrea Martin | ... | Queen Slug-For-A-Butt (voice) | |
| Kath Soucie | ... | Princess What's-Her-Name / Billy (voice) | |
Produced by
| Kathi Castillo | ... | producer |
| David Perry | ... | executive producer |
| Roy Allen Smith | ... | producer |
| Doug TenNapel | ... | executive producer |
Music by
| William Anderson | ||
| Patrick Griffin | ... | (uncredited) |
Editing by
| Jay Bixsen | ||
Art Department
| Vincent Waller | ... | storyboard artist |
Additional Crew
| Ginny McSwain | ... | voice director |