Two episodes of the TV series "The Persuaders" joined into a movie. Two playboys, Brett Sinclair (Roger Moore) and Danny Wilde (Tony Curtis), investigate crimes.
A planet is discovered in the same orbit as Earth's but is located on the exact opposite side of the sun, making it not visible from Earth. The European Space Exploration Council decide to send American astronaut Glenn Ross and British scientist John Kane via spaceship to explore the other planet.
The Limbo Line tells a story of Cold War double-crossing with British secret agent Manston trying to break up a group of Russian agents who return defectors to Moscow for brainwashing. When a Russian ballerina defects to Germany, Manston goes after the head of The Limbo Line in an effort to stop the group from kidnapping the defectors. Acting against the orders of his boss, Manston is faced with killing the communist leader of the movement in Germany or allowing the dancer to be turned over for interrogation and reprisals for her political beliefs. Matters are further complicated when Manston finds himself falling for the ballerina…
