As part of a criminal operation to seize £1 million in bank notes en route to London, the train carrying the shipment is diverted to the disused Buffler's Halt Station. Unwin and Matthew help to subdue the gang responsible. However, on the way back up the line, stationmaster Albert Hobson realises that he cannot stop the train, which is travelling at 80 miles per hour.

SHADO officially goes into operation and encounters its first UFO. An alien pilot is captured and discovered to have transplanted human organs within him.

Clip show episode: Joe reaches his tenth birthday, and celebrates with his friends as they reminisce over his many adventures.

The Terrahawks struggle to defend against the aliens' strange powers, and find they may be forced to stop the attack at the cost of Ninestein's life.

Zelda attacks NASA's outpost on Mars and establishes her home, then mounts an attack on Earth, forcing the Terrahawks into battle.

Three men kidnap Colonel White's daughter, Victoria and threaten to harm her unless the Colonel uses a Spectrum Rhino and help them mount an attack on an armored express train en route to Paris so that they can steal its cargo of $1 billion in gold bullion. But it is all part of a Mysteron plot by Captain Black to incriminate the Colonel in the robbery and thus end his Spectrum career. Whilst Colonel White pretends to go through with the robbery, Captain's Scarlet and Blue must get Victoria back.

The Mysterons threaten to assassinate the commanders of Earth's armed forces.

The Contessa risks her life when a deceptive new client uses her to escape the police.

A routine sweep on a counterfeiting operation goes horribly wrong for the officers of Precinct 88 when they are suddenly attacked by an unstoppable Cyborg and Took is caught in the crossfire. The Cyborg has Brogan marked for death and, one by one, Brogan's colleagues fall victim to the creature...

Tailing Short Fred Ledd to the planet Icesester, Sproggle is captured by the pirate who holds him hostage. Fred is after the Icesester Diamond, the largest diamond in the universe with the power to absorb the energy of a sun. If the Paradox crew don’t find the diamond for him within thirty minutes, Fred will cut off Sproggle’s bauble.