| Episode credited cast: |
 | Charlie Adler | - | Spat / Bill / Biff / Granny / J.B. / Jasper / Prof. Wiggly / Dr. Steggy / Additional Voices (voice) |
 | Curtis Armstrong | - | Scooter (voice) |
 | Dan Castellaneta | - | Mittens / Bill (voice) |
 | Elizabeth Daily | - | Wendy Elizabeth (voice) (as E.G. Daily) |
 | Fabio | - | Himself (voice) |
 | Brad Garrett | - | Thuggo (voice) |
 | Karen Haber | - | Annabelle (voice) |
 | Savage Steve Holland | - | Doc Tari / Additional Voices (voice) |
 | John Kassir | - | Mittens (II), (voice) |
| Bill Kopp | - | Eek (voice) |
 | Gary Owens | - | Additional Voices (voice) |
 | Jason Priestley | - | Bo Diddly Squat (voice) |
 | Cynthia Rothrock | - | Herself (voice) |
 | Kurtwood Smith | - | Dinosaur Military Commander (voice) |
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