Following the events of Lunarville 7, Scarlet, Blue and Green return to the Moon to destroy the Mysteron's newly completed base in the Humboldt Sea.

A wealthy widow's daughter is kidnapped and Harry is required to drop off the ransom money.

Chris attempts to broaden the remit of the Randomiser by reviewing an episode of a non-Gerry Anderson series made by someone who used to work for Gerry Anderson and who used this particular episode to pay tribute to his days working on Gerry Anderson shows. The experiment backfired horribly.

Whilst exploring a bizarre asteroid, Koenig is detained and replaced by a double which directs Alpha to direct most of its energy at the asteroid. Some of the crew react negatively at his double's dictatorial behaviour.

Pedro and Fernando plan to rid themselves of the sheriff, by switching his hat with the magic feathers for a normal one.

While the BIG RAT is out of action, Joe dreams of life as a sheriff in the Wild West.

The Protectors, attempting to guard an Italian senator in Rome, find a blackmailer who has got out of control.

Torchy's rocket arrives in Topsy Turvy Land, and he tries to convince Pom-Pom and the toys to return to Earth, but they decline. Flopsy, the ragdoll, complains about her lack of stuffing, so Torchy convinces Pom-Pom to donate some of her fur.

Kate is taken hostage by Anderburr Records employee "Stew" Dapples, who is under Zelda's control.

Straker and Foster investigate an undersea alien base where SHADO and its personnel have been duplicated.