When scientists exploring the Amazon River stumble on a “missing link” connecting humans and fish, they plan to capture it for later study. But the Creature has plans of his own, and has set his sights on the lead scientist's beautiful fiancée, Kay.
Richard Carlson
as Dr. David Reed
Julie Adams
as Kay Lawrence
Richard Denning
as Dr. Mark Williams
Antonio Moreno
as Dr. Carl Maia
Nestor Paiva
as Captain Lucas
Whit Bissell
as Dr. Edwin Thompson
Bernie Gozier
as Zee
Henry A. Escalante
as Chico
Ricou Browning
as The Gill Man In Water (uncredited)
Ben Chapman
as The Gill Man On Land (uncredited)
Art Gilmore
as Narrator (voice) (uncredited)
Perry Lopez
as Tomas (uncredited)
