

17/01/1955
Depois de ter sobrevivido às balas, o monstro é capturado e enviado para um aquário na Flórida, onde é estudado pelo psicólogo animal Professor Clete Ferguson e pela estudante de ictiologia Helen Dobson.

John Agar
as Prof. Clete Ferguson

Lori Nelson
as Helen Dobson

John Bromfield
as Joe Hayes

Nestor Paiva
as Captain Lucas

Grandon Rhodes
as Jackson Foster

Dave Willock
as Lou Gibson

Robert B. Williams
as George Johnson

Charles Cane
as Police Captain

Loretta Agar
as Woman on Boat (uncredited)

Bill Baldwin
as Patrol Boat Dispatcher (voice / uncredited)

Jere Beery
as Photographer (uncredited)

Ricou Browning
as The Gill Man (in water) / Lab Technician (uncredited)

Diane DeLaire
as Miss Abbott (uncredited)

Mike Doyle
as Cop (uncredited)

Clint Eastwood
as Jennings (uncredited)

Jack Gargan
as Skipper (uncredited)

Charles Gibb
as Cop (uncredited)

Brett Halsey
as Pete (uncredited)

Don C. Harvey
as Mac - Spotlight Party Leader (uncredited)

Tom Hennesy
as The Gill Man (on land) / Marineland Diver (uncredited)

Don House
as Diver (uncredited)

Robert F. Hoy
as Charlie (uncredited)

Ned Le Fevre
as Newscaster (uncredited)

Sydney Mason
as Police Announcer (uncredited)

Robert Nelson
as Dr. McCuller (uncredited)

Patricia Powers
as Girl in Convertible

Bert Stevens
as Search Party Member (uncredited)

Charles Victor
as Policeman (uncredited)

Robert Wehling
as Joe (uncredited)

James R. Wolfe
as Man at Tank (uncredited)
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