In this puppet adventure, the crime fighters known as the International Rescue team, led by the heroic Jeff Tracy (Peter Dyneley) and his equally brave sons, are managing security during the launching of the first manned flight to Mars. Jeff and the boys foil some crooks who want to sabotage the mission, and the craft takes off successfully. But later, as the astronauts try to return to Earth, they encounter grave technical difficulties, and the Rescue team must fly into space to save them.