Summary
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.
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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
Bill Baldwin
Patrol Boat Dispatcher (voice / uncredited)
Diane DeLaire
Miss Abbott (uncredited)
Clint Eastwood
Jennings (uncredited)
Brett Halsey
Pete (uncredited)
Don C. Harvey
Mac - Spotlight Party Leader (uncredited)
Robert F. Hoy
Charlie (uncredited)
Bert Stevens
Search Party Member (uncredited)