Director: Richard Fleischer

Cast: Stephen Boyd, Raquel Welch, Edmond O'Brien, Donald Pleasence, Arthur O'Connell

Directed by Richard Fleischer, this 1966 adventure film carries an IMDb rating of 6.8.

Synopsis

A scientist is nearly assassinated. In order to save him, a submarine is shrunken to microscopic size and injected into his blood stream with a small crew. Problems arise almost as soon as they enter the bloodstream.