A scientific expedition searching for fossils along the Amazon River discover a prehistoric Gill-Man in the legendary Black Lagoon. The explorers capture the mysterious creature, but it breaks free. The Gill-Man returns to kidnap the lovely Kay, fiancée of one of the expedition, with whom it has fallen in love.
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Harry Essex Arthur A. Ross Maurice Zimm
Henry Mancini Hans J. Salter Herman Stein Leslie I. Carey Joe Lapis
William E. Snyder
Ted J. Kent
Hilyard M. Brown Bernard Herzbrun Russell A. Gausman Ray Jeffers
Joan St. Oegger Bud Westmore