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.
Director: Richard Fleischer
Cast: 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, Kenneth MacDonald, Christopher Riordan