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