Director
Jack Arnold
DIRECTOR
Writer
William Alland
WRITER
Martin Berkeley
Stars (in credits order)
John Agar
Prof. Clete Ferguson
Lori Nelson
Helen Dobson
John Bromfield
Joe Hayes
Nestor Paiva
Captain Lucas
Grandon Rhodes
Jackson Foster
Dave Willock
Lou Gibson
Robert Williams
George Johnson
Charles Cane
Captain of Police
Loretta Agar
Woman on Boat (uncredited)
Bill Baldwin
Patrol Boat Dispatcher (uncredited) (voice)
Jere Beery Sr.
Photographer (uncredited)
Ricou Browning
The Gill Man (In Water) (uncredited)
Diane DeLaire
Miss Abbott (uncredited)
Mike Doyle
Cop (uncredited)
Clint Eastwood
Jennings (uncredited)
Jack Gargan
Skipper (uncredited)
Charles A. Gibbs
Brett Halsey
Pete (uncredited)
Don C. Harvey
Mac - Spotlight Party Leader (uncredited)
Tom Hennesy
The Gill Man (on land) (uncredited)
Don House
Diver (uncredited)
Bob Hoy
Charlie (uncredited)
Ned Le Fevre
Newscaster (uncredited)
Sydney Mason
Police Announcer (uncredited)
Robert Nelson
Dr. McCuller (uncredited)
Patricia Powers
Girl in Convertible (uncredited)
Bert Stevens
Search Party Member (uncredited)
Charles Victor
Policeman (uncredited)
Bob Wehling
Joe (uncredited)
James R. Wolfe
Man at Tank (uncredited)
