Character Name : Prof. Clete Ferguson

Original Name : John Agar

Gender : Male

Character Name : Helen Dobson

Original Name : Lori Nelson

Gender : Female

Character Name : Joe Hayes

Original Name : John Bromfield

Gender : Male

Character Name : Captain Lucas

Original Name : Nestor Paiva

Gender : Male

Character Name : Jackson Foster

Original Name : Grandon Rhodes

Gender : Male

Character Name : Lou Gibson

Original Name : Dave Willock

Gender : Male

Character Name : George Johnson

Original Name : Robert B. Williams

Gender : Male

Character Name : Police Captain

Original Name : Charles Cane

Gender : Male

Character Name : Woman on Boat (uncredited)

Original Name : Loretta Agar

Gender : Male

Character Name : Patrol Boat Dispatcher (voice / uncredited)

Original Name : Bill Baldwin

Gender : Male

Character Name : Photographer (uncredited)

Original Name : Jere Beery

Gender : Male

Character Name : The Gill Man (in water) / Lab Technician (uncredited)

Original Name : Ricou Browning

Gender : Male

Character Name : Miss Abbott (uncredited)

Original Name : Diane DeLaire

Gender : Female

Character Name : Cop (uncredited)

Original Name : Mike Doyle

Gender : Male

Character Name : Jennings (uncredited)

Original Name : Clint Eastwood

Gender : Male

Character Name : Skipper (uncredited)

Original Name : Jack Gargan

Gender : Male

Character Name : Cop (uncredited)

Original Name : Charles Gibb

Gender : Male

Character Name : Pete (uncredited)

Original Name : Brett Halsey

Gender : Male

Character Name : Mac - Spotlight Party Leader (uncredited)

Original Name : Don C. Harvey

Gender : Male

Character Name : The Gill Man (on land) / Marineland Diver (uncredited)

Original Name : Tom Hennesy

Gender : Male

Character Name : Diver (uncredited)

Original Name : Don House

Gender : Male

Character Name : Charlie (uncredited)

Original Name : Robert F. Hoy

Gender : Male

Character Name : Newscaster (uncredited)

Original Name : Ned Le Fevre

Gender : Male

Character Name : Police Announcer (uncredited)

Original Name : Sydney Mason

Gender : Male

Character Name : Dr. McCuller (uncredited)

Original Name : Robert Nelson

Gender : Male

Character Name : Girl in Convertible

Original Name : Patricia Powers

Gender : Female

Character Name : Search Party Member (uncredited)

Original Name : Bert Stevens

Gender : Male

Character Name : Policeman (uncredited)

Original Name : Charles Victor

Gender : Male

Character Name : Joe (uncredited)

Original Name : Robert Wehling

Gender : Male

Character Name : Man at Tank (uncredited)

Original Name : James R. Wolfe

Gender : Male