On screen
Cast
15 credited performers
Richard Carlson
Dr. David Reed
Julie Adams
Kay Lawrence
Richard Denning
Dr. Mark Williams
Antonio Moreno
Dr. Carl Maia
Nestor Paiva
Captain Lucas
Whit Bissell
Dr. Edwin Thompson
Bernie Gozier
Zee
Artwork unavailable
Henry A. Escalante
Chico
Ricou Browning
The Gill Man In Water (uncredited)
Art Gilmore
Narrator (voice) (uncredited)
Perry Lopez
Tomas (uncredited)
Artwork unavailable
Sydney Mason
Dr. Matos (uncredited)
Rodd Redwing
Luis (uncredited)
Artwork unavailable
James Miller
Old Man (uncredited)
Ben Chapman
The Gill Man On Land (uncredited)