In a tributary of the Amazon, a monster – half-man, half-fish – is captured and placed in a reservoir in a Florida national park to be observed by scientists.
Trailer
Cast
John Agar
(Prof. Clete Ferguson)
Lori Nelson
(Helen Dobson)
John Bromfield
(Joe Hayes)
Nestor Paiva
(Captain Lucas)
Grandon Rhodes
(Jackson Foster)
Dave Willock
(Lou Gibson)
Robert B. Williams
(George Johnson)
Charles Cane
(Police Captain)
Loretta Agar
(Woman on Boat (uncredited))
Bill Baldwin
(Patrol Boat Dispatcher (voice / uncredited))
Jere Beery
(Photographer (uncredited))
Ricou Browning
(The Gill Man (in water) / Lab Technician (uncredited))
Diane DeLaire
(Miss Abbott (uncredited))
Mike Doyle
(Cop (uncredited))
Clint Eastwood
(Jennings (uncredited))
Jack Gargan
(Skipper (uncredited))
Charles Gibb
(Cop (uncredited))
Brett Halsey
(Pete (uncredited))
Don C. Harvey
(Mac - Spotlight Party Leader (uncredited))
Tom Hennesy
(The Gill Man (on land) / Marineland Diver (uncredited))