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- Richard Carlson as Dr. David Reed
- Julie Adams as Kay Lawrence
- Richard Denning as Mark Williams
- Antonio Moreno as Dr. Carl Maia
- Nestor Paiva as Lucas
- Whit Bissell as Dr. Edwin Thompson
- Bernie Gozier as Zee
- Henry A. Escalante as Chico
- Perry Lopez as Tomas
- Rodd Redwing as Luis
- Ben Chapman as Gill-man (land)
- Ricou Browning as Gill-man (underwater)