"In order to save an assassinated scientist, a submarine and its crew are shrunk to microscopic size and injected into his bloodstream."
Stephen Boyd
as Grant
Raquel Welch
as Cora
Edmond O'Brien
as General Carter
Donald Pleasence
as Dr. Michaels
Arthur O'Connell
as Col. Donald Reid
William Redfield
as Capt. Bill Owens
Arthur Kennedy
as Dr. Duval
Jean Del Val
as Jan Benes
Barry Coe
as Communications Aide
Ken Scott
as Secret Service
Shelby Grant
as Nurse
James Brolin
as Technician
Brendan Fitzgerald
as Wireless Operator
Brendon Boone
as Military Policeman (uncredited)
James Doohan
as Dr. Sawyer (Hypothermia technician) (uncredited)
Kenneth MacDonald
as Henry - Heart Monitoring (uncredited)
Christopher Riordan
as Young Scientist (uncredited)
Leonard Rosenman
Original Music Composer
William B. Murphy
Editor
Dale Hennesy
Art Direction
Richard Fleischer
Director
Stuart A. Reiss
Set Decoration
Walter M. Scott
David Duncan
Adaptation
Otto Klement
Story
Saul David
Producer
Ernest Laszlo
Director of Photography
Jack Martin Smith
Jerome Bixby
Ben Nye
Makeup Artist
Margaret Donovan
Hairstylist
Harry Kleiner
Screenplay
Eric Stacey
Unit Production Manager
Walter Rossi
Sound Effects
David Dockendorf
Sound
Ad Schaumer
Assistant Director
Bernard Freericks
Fred Zendar
Technical Advisor
Art Cruickshank
Special Effects
Richard Kuhn
Title Designer
Peter Foy
Aerial Coordinator
L.B. Abbott
Harper Goff
Researcher
Emil Kosa Jr.