Zodiac and a geologist attempt to solve the mysteries of the seemingly deserted planet Electron, which is replete with electric rocks and weird, poltergeistic happenings.

A bathyscaphe is trapped in the deepest point in the Pacific.

Jane and Took are assigned to protect a shipment of Luxorian Ice, a vital part of Solartek's new solar power system which offers a safe alternative to hyper fusion. Meanwhile, Brogan and Haldane investigate the death of reformed jewel thief Vella Sugoi and discover a connection that leads to a deadly struggle for control of Demeter's lucrative energy franchise.

After several cases of random suicides, an investigation into the latest one leads Captain Blue to inadvertently upload a virus to Skybase's computers. Everyone on the base apart from Captain Scarlet and Destiny Angel are infected by the deadly virus which makes people end their own lives. Scarlet and Destiny must erase the virus before they too become infected.

The Mysterons threaten to kill one of Spectrum's Angel pilots.

The Protectors find themselves in the middle of a war over some antiques.

Rocky has a toothache, but nothing anyone says can persuade him to have his tooth removed by Doc Haggerty.

The Moon is on a collision course with an enormous planet. On a scouting mission, Koenig encounters Arra, the Queen of Atheria. The aged monarch proclaims the collision is a preordained event and must occur for her people to evolve to a higher plane of existence. Now Koenig must convince his crew to have faith and do nothing in the face of apparent destruction.

A malfunctioning solar reflector menaces the Italian coastal village of Monte Bianco, where Lady Penelope and Parker happen to be visiting while on holiday.

The Stingray crew investigate a disused lighthouse emitting unexplained signals.