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
