|Richard Fleischer Director||previously directed Barabbas|
In order to save a scientist, a submarine and its crew are shrunk to microscopic size and inserted into his body.
A novelization of the movie was made and released before the actual movie came out. This led to the mistaken assumption that the movie is based on a book-it isn't.
|Edmond O'Brien||General Carter|
|Donald Pleasence||Dr. Michaels|
|Arthur O'Connell||Col. Donald Reid|
|William Redfield||Capt. Bill Owens|
|Arthur Kennedy||Dr. Duval|
|Jean Del Val||Jan Benes|
|Barry Coe||Communications Aide|
|Ken Scott||Secret Service|
|See Full Credits|