When a blood clot renders a scientist comatose, a submarine and its crew are shrunk and injected into his bloodstream in order to save him.
Richard Fleischer
Stephen Boyd
Raquel Welch
Edmond O'Brien
Donald Pleasence
Arthur O'Connell
William Redfield
Arthur Kennedy
Jean Del Val
Barry Coe
Ken Scott
Shelby Grant
James Brolin
Brendan Fitzgerald
Brendon Boone
James Doohan
20th Century Fox
