Full Cast List ▾
John Agar
Prof. Clete Ferguson
Lori Nelson
Helen Dobson
John Bromfield
Joe Hayes
Nestor Paiva
Captain Lucas
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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)
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Jere Beery
Photographer (uncredited)
Ricou Browning
The Gill Man (in water) / Lab Technician (uncredited)
Diane DeLaire
Miss Abbott (uncredited)
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Mike Doyle
Cop (uncredited)
Clint Eastwood
Jennings (uncredited)
Jack Gargan
Skipper (uncredited)
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Charles Gibb
Cop (uncredited)
Brett Halsey
Pete (uncredited)
Don C. Harvey
Mac - Spotlight Party Leader (uncredited)
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Tom Hennesy
The Gill Man (on land) / Marineland Diver (uncredited)
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Don House
Diver (uncredited)
Robert F. Hoy
Charlie (uncredited)
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Ned Le Fevre
Newscaster (uncredited)
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Sydney Mason
Police Announcer (uncredited)
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Robert Nelson
Dr. McCuller (uncredited)
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Patricia Powers
Girl in Convertible
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Bert Stevens
Search Party Member (uncredited)
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Charles Victor
Policeman (uncredited)
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Robert Wehling
Joe (uncredited)
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James R. Wolfe
Man at Tank (uncredited)
