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
Written by: Martin Berkeley
Runtime: 82 minutes
Critics score:
Tagline: All New Thrills! Shocks! Suspense!
Related titles:
Cast:
John Agar John Agar
Prof. Clete Ferguson 
Lori Nelson Lori Nelson
Helen Dobson 
John Bromfield John Bromfield
Joe Hayes 
Nestor Paiva Nestor Paiva
Captain Lucas 
Grandon Rhodes Grandon Rhodes
Jackson Foster 
Dave Willock Dave Willock
Lou Gibson 
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Also known as:
  • Jack Arnold - Die Rache des Ungeheuers
  • la venganza del hombre monstruo
  • Creature From The Black Lagoon 2: Revenge of the Creature