When a Soviet superscientist falls into a coma, it’s up to a team of his colleagues to save his life by being shrunk down and sent into his body. Director and master of widescreen Richard Fleischer (20,000 Leagues Under the Sea) laces the adventure with groovy special effects, as the scientist’s submarine (the “Proteus”) journeys through the treacherous heart and lungs and faces the wrath of protective blood cells. Raquel stars as technical assistant Cora, alongside Arthur Kennedy, Donald Pleasence, and Stephen Boyd.