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Synopsis
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.
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)