A 500-ton U.S. Army walker, Sidewinder, falls into a pit during testing and International Rescue are called to save the crew trapped inside.

Lady Penelope goes on the trail of a kidnapped scientist, only to find herself in mortal danger at the hands of a megalomaniac determined to exploit the expert's work to his advantage.

The Hood sabotages the Red Arrow aircraft programme. One of the planes crashes into the TV Tower in England during a brutal rain storm, and International Rescue is summoned to save the engineers inside the tower before it collapses; making their job trickier apart from the driving rain and winds at the site is that the Red Arrow's director, a long time friend of Jeff, is fired from the project and stays at Tracy Island, forcing the Tracys to draw him away and thus remain oblivious to International Rescue's existence.

While returning to base, Scott is attacked by mysterious fighter aircraft and shot down over the Sahara. He is discovered by two archaeologists, who send him on his way, only to find themselves entombed within the lost Pyramid of Khamandides.

A series of unexplained Fireflash airliner disappearances sees Thunderbird 4 being called to rescue a crew stranded on the ocean floor. International Rescue then volunteer its services in helping to diagnose the cause of the mechanical fault.

A gang of criminals masquerade as International Rescue to conceal their theft of top-secret military plans. The ensuing worldwide manhunt for International Rescue leaves the organisation powerless to operate in a rescue situation until its name is vindicated, just as a member of a manned reconnaissance satellite is suddenly trapped in space while trying to repair the station.

When the Ocean Pioneer tanker inexplicably explodes, Brains investigates the cause. With some help from Lady Penelope, he discovers it to be a chemical reaction between the cargo of liquid Alsterene and OD60, which is found in the sea. International Rescue set out to save the crew of the ill-fated Ocean Pioneer II.

Clip show episode: the Tracy family cannot help but reminisce about their many successful missions after a young boy infiltrates the island. They are nevertheless burdened by the problem that the boy knows their identity and the location of their base – until Jeff realises that they can use the boy's dreams to their own advantage. Includes clips from "End of the Road", "Sun Probe", "Trapped in the Sky" and "Day of Disaster".

World Navy tests of a nuclear torpedo inadvertently threaten the offshore rig Seascape. Jeff, having been invited by Lady Penelope to join her on holiday in Australia, places Scott in charge of International Rescue, with Alan substituting for Scott at the helm of Thunderbird 1. Jeff though is angered when Scott launches a rescue effort to the mid-ocean rig.

The passenger aircraft Skythrust, conceived by Brains using his real name (Hiram Hackenbacker) as an alias, falls into the hands of fashion criminals who hi-jack the plane to steal a new French design from the renowned François Lemaire.

While Christmas preparations are underway at both Tracy Island and a local children's hospital, which is expanding to incorporate a new radiotherapy wing, a pair of criminals attempt to burgle a high-tech vault storing gold bullion.