Horror Sci-Fi
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.
Directed by
Jack Arnold
Clint Eastwood
Jennings (uncredited)
John Agar
Prof. Clete Ferguson
Bill Baldwin
Patrol Boat Dispatcher (voice / uncredited)
Brett Halsey
Pete (uncredited)
Don C. Harvey
Mac - Spotlight Party Leader (uncredited)
Ricou Browning
The Gill Man (in water) / Lab Technician (uncredited)
Robert B. Williams
George Johnson
Diane DeLaire
Miss Abbott (uncredited)
Nestor Paiva
Captain Lucas
John Bromfield
Joe Hayes
Lori Nelson
Helen Dobson
Robert F. Hoy
Charlie (uncredited)
Dave Willock
Lou Gibson
Jack Gargan
Skipper (uncredited)
Charles Cane
Police Captain
Loretta Agar
Woman on Boat (uncredited)
Grandon Rhodes
Jackson Foster
Jere Beery
Photographer (uncredited)
Mike Doyle
Cop (uncredited)
Charles Gibb
Cop (uncredited)
Tom Hennesy
The Gill Man (on land) / Marineland Diver (uncredited)
Don House
Diver (uncredited)
Ned Le Fevre
Newscaster (uncredited)
Sydney Mason
Police Announcer (uncredited)
Patricia Powers
Girl in Convertible
Bert Stevens
Search Party Member (uncredited)
Charles Victor
Policeman (uncredited)
Robert Wehling
Joe (uncredited)

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