A scientific expedition travels up the Amazon in search of fossil evidence of a link between marine life and land animals. The researchers instead find a living amphibious humanoid dwelling in a hidden lagoon, and their attempt to capture it for study turns into a struggle to survive, complicated by the creature's fixation on Kay, the fiancée of one of the scientists.
Jack Arnold directed the film, which followed his 1953 picture It Came from Outer Space and preceded Tarantula, Revenge of the Creature, This Island Earth and The Incredible Shrinking Man on his filmography, among later titles. Harry Essex and Arthur A. Ross wrote the screenplay, William Alland produced, and the cast is led by Richard Carlson as Dr. David Reed, Julie Adams as Kay Lawrence, Richard Denning as Dr. Mark Williams, Antonio Moreno as Dr. Carl Maia, Nestor Paiva as Captain Lucas and Whit Bissell as Dr. Edwin Thompson. Universal Pictures released the film in 1954, and it runs 79 minutes.
On IMDb it holds a 6.9 rating from more than 33,000 votes, while on TMDB it sits at 6.8 from a much smaller vote count, indicating a durable following rather than a broad modern audience. A critics' rating of 7.1 from 45 reviews places critical regard slightly above the audience scores. The worldwide box office of 1 million dollars was a modest return for a 1950s studio release.
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