In order to save an assassinated scientist, a submarine and its crew are shrunk to microscopic size and injected into his bloodstream.
Grant
Cora
General Carter
Dr. Michaels
Col. Donald Reid
Capt. Bill Owens
Dr. Duval
Jan Benes
Communications Aide
Secret Service
Nurse
Technician
Wireless Operator
Military Policeman (uncredited)
Dr. Sawyer (Hypothermia technician) (uncredited)
Henry - Heart Monitoring (uncredited)
Young Scientist (uncredited)
