Fleets of UFOs roam around the Moon Base. One manages to land and is confronted by Colonel Foster who is then accused of treason for having collaborated with the alien pilot in an attempt to survive on the lunar surface. Foster flees, chased by security agents, while Commander Straker and Colonel Freeman investigate to exonerate him.

A compilation of four episodes from the Supermarionation series Stingray. When aquatic aliens plot to take over the planet, the world aquanaut security patrol are called in to battle the aliens.

When the launch of a mission to Mars goes awry due to sabotage, International Rescue is requested to assist in the mission's second attempt.