Prof. Clete Ferguson
Helen Dobson
Joseph Hayes
Capt. Lucas
Jackson Foster
Lou Gibson
George Johnson
Police Captain
Woman on boat
Creature (underwater)
Creature (on land)
Miss Abbott, chimp trainer
Jennings, a lab technician)
Teenager killed by creature
Mack, a professor
Joe, man with searchlight
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John Agar
Lori Nelson
John Bromfield
Nestor Paiva
Grandon Rhodes
Dave Willock
Robert B. Williams
Charles R. Cane
Loretta Agar
Ricou Browning
Ben Chapman
Diana DeLaire
Clint Eastwood
Brett Halsey
Don C. Harvey
Bob Wehling
Producer
Director
Screenplay
Director of Photography
Editor
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William Alland
Jack Arnold
Martin Berkeley
Charles S. Welbourne
Paul Weatherwax