Captain Scarlet and Captain Blue are sent to Mars to obtain vital reconnaissance photographs, but their mission is threatened when an astronomer is taken over by The Mysterons. Meanwhile, the Lunar Controller claims to have a plan to negotiate peace between the Moon and the Mysterons, leading the agents to investigate. They then volunteer for a dangerous mission to destroy a Mysteron complex on the Moon and eventually use a recovered pulsator to try and sue for peace with the Mysterons.
Revenge of the Mysterons from Mars
A battle for lunar control ensues as Captain Scarlet and the Spectrum organization confront the Mysterons, a Martian force determined to gain a foothold on the moon.
