Full Cast - K.O. Beast (OVA) (episodes 1 to 7)
- 1. unknown
Episodic: Bill Rogers (Shaba Derbard), Leicester Tunks (Brains, Dr. Password)
Additional Voices: Bill Rogers, Tim Mitchel
- 2. unknown
Episodic: Bill Rogers (Dog Clan Elder), Pete Zarustica (Bud Mint's Grandfather), Tim Mitchel (Brains)
Additional Voices: Bill Rogers, Joe DiGiorgi
- 3. unknown
Episodic: Bill Rogers (Gaia's Terminal), Tim Mitchel (Brains)
Additional Voices: Bill Rogers, Joe DiGiorgi
- 4. unknown
Episodic: Daniel Kevin Harrison (Don the Repairer), Jessica Calvello (S.P. Icegal), Leicester Tunks (Brains)
Additional Voices: Bill Rogers, Roxanne Beck
- 5. unknown
Episodic: Jessica Calvello (S.P. Icegal), Leicester Tunks (Brains), Roxanne Beck (Mei-mer's Mother)
Additional Voices: Bill Rogers, Eddie Paulson, Roxanne Beck
- 6. unknown
Episodic: Jessica Calvello (S.P. Icegal), Leicester Tunks (Brains, Dr. Password)
Additional Voices: Bill Rogers, Roxanne Beck
- 7. unknown
Episodic: Jessica Calvello (S.P. Icegal), Lisa Ortiz (Gaia)
Additional Voices: Roxanne Beck, Tim Mitchel