| Episode credited cast: |
 | Jefferson Black | - | Park Ranger / Butler / Hybridon (voice) (as Jeff Black) |
 | Clancy Brown | - | Alexander Paine (voice) |
 | Brian Donovan | - | Ollie 'Shark' Sharkster (voice) |
 | Bill Fagerbakke | - | Albert 'Flesh' (voice) |
 | Erin Fitzgerald | - | Dr. Rachelle Logan / Girl (voice) |
 | Aldis Hodge | - | King (voice) |
 | Charles Howerton | - | Kip Hawkes - Jr. & Sr. (voice) |
 | Tom Kenny | - | Mr. Lee / Spydah (voice) |
| Alli Mauzey | - | Catalina Leone 'Lioness' (voice) |
 | Charlie Schlatter | - | Hawk (voice) |
| Pete Sepenuk | - | Dr. Nimbus / Bonez (voice) |
 | James Arnold Taylor | - | Axel Manning (voice) |
 | Kari Wahlgren | - | Magness (voice) |
 | Isabella Way | - | Laura (voice) |
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