Set during the Cold War, the US and Soviet Union have discovered the technique of shrinking however the process only lasts for an hour. Scientist Dr. Jan Benes ends up in a coma after a attempted assassination when heading back to the US (working under the Soviet Union). Dr. Benes knows how to extend the time for the shrinking process but there is no way they can preform the surgery from the outside. A team of experts must be shrunk down in a submarine to preform the surgery from within but only have one hour to save Dr. Benes life along with overcoming many obstacles of the human body. Directed by Richard Fleischer. Based on a story by Otto Klement and Jerome Bixby. An animated television series was produced by Filmation inspired of the film.