The XL5 crew are imprisoned on an uncharted world by two Domeheads, who intend to wipe their memories and keep them there forever. It is up to Robert the Robot to rescue them.

Intro special guest: Maria Teresa Creasey

Joe is brained up with the skills of an expert explorer to save three miners endangered by their own explosives test.

Intro special guest: Rodney Matthews

Zelda lures Ninestein with the captured two-man crew of a commercial space transporter. When the Terrahawks electronically isolate themselves from after rescuing the men, Kate has to inform Ninestein that the mission to get him back is ahead of schedule.

Intro special guest: Rodney Matthews

Three disused freighters mysteriously disappear shortly before they are due to self-destruct.

Intro special guest: James Swallow

A lush Earth-type planet holds the promise of a new home for the people of Moonbase Alpha. When the reconnaissance Eagle returns, it carries an unexpected passenger: Helena's husband, who died five years ago. The mysterious Lee Russell tells the Alphans that death awaits them on the new planet. The Alphans ignore his warning and unknowingly descend into a world of antimatter.

Intro special guest: Paul Shipper

Convict George Gray breaks out of prison and makes contact with Sir Humphrey Burton, who has promised him passage out of Britain aboard a submarine. Unwin is assigned to intercept the pair.

Intro special guest: Paul Shipper

Destiny Angel is kidnapped by Captain Black, and sometime later, it looks as though Destiny has staged a daring robbery of some missile launch codes. It appears that she has turned into a Mysteron agent, but things are not as they appear when Captain Scarlet goes looking for her and finds that her so-called "betrayal" is only the first stage in an attack on Skybase.

Intro special guest: Gary Tomkins

Marvin Jackson is trying to sell the Eureka Silver Mine, but the main buyer, Harman, pays Pedro and Fernando to pretend to be ghosts to bring the price down.

Intro special guest: Gary Tomkins

A SHADO interceptor pilot is placed under a hypnotic spell by an alien-influenced cat.

Intro special guest: Sam Clemens.

The daughter of a gangster returns after his death to kill Harry. Or does she?