Spectrum sends Captains Scarlet and Black on a search of the desert surface of Mars to find out who is sending a mysterious extra-planetary signal.

The Mysterons resurrect Captain Black and turn him into the enemy, so Captains Blue and Scarlet must work together to stop Captain Black.

A swarm of cyberbugs make their way into Skybase and begins to eat its way towards the atomic reactor core.

Elysium base on Mars has stopped transmitting, so a team of captains Scarlet and Blue, Destiny and Harmony Angels, and Doctor Gold are sent to find out what happened to the crew.

A space capsule escape pod from the Endeavor II, a manned mission to Jupiter which mysteriously disappeared 15 years ago, returns to Earth with Lieutenant Green's father, Commander Lewis, aboard.

Spectrum receives a transmission from unidentified extortionists who demand a ransom of $50 million in diamonds or else they will initiate Mercury's re-entry over North America and crash a shuttle into Washington DC.