Alan’s driving lessons with Parker get serious when burglars kidnap Lady Penelope and Aunt Sylvia.

When a joint operation with the Global Defense Force nearly ends in disaster, International Rescue is banned from intervening in future missions.

Kayo and the rest of International Rescue are put to the test when a central air-traffic control facility suddenly goes offline.

Scott, Kayo, and Lady Penelope must save Parker when a sting operation by the GDF ends with a cybertech thief on the run.

A number of carefully staged “disasters” require the full attention of International Rescue, but Kayo discovers that they are all part of an elaborate plot.

A geological survey team becomes trapped when a huge earth-breaking vehicle, controlled by a villain known only as the Mechanic, causes them to fall into a narrow crevice. International Rescue launches Thunderbirds 1, 2 and Shadow while the Global Defence Force attempt to tackle the Mechanic. When Thunderbird 2 is badly damaged and must return to Tracy Island, and the GDF is neutralised by the Mechanic, Kayo is left to stop him and his drones while Scott must rescue the survey team. Meanwhile Lady Penelope and Parker visit the Hood in solitary confinement in Parkmoor Scrubs prison, as they believe he is behind the mysterious Mechanic.

A distress call is received from Captain Ridley O'Bannon, a GDF astronaut, on the abandoned interstellar ship Eden orbiting between the Earth and the Moon. John attempts a rescue from Thunderbird 5 wearing an exo-pod, but is trapped with O'Bannon by mysterious spider-like robots. Alan attempts a rescue in Thunderbird 3, and they discover two salvage workers are posing as pirates.

On Jupiter's moon Europa, the stars of Gordon's favorite explorer program (Buddy and Ellie Pendergast) are searching for extra-terrestrial life. When they begin drilling into the ice, pressure from geysers causes the ice to crack and they plunge into an underground ocean ten miles below. Alan (in command) and Gordon blast off to the rescue in Thunderbird 3, with Thunderbird 4 stored abroad and modified with skis, powerful engines and a heat drill to penetrate the ice, which they lose due to strong underwater currents. They find the Pendergasts, who have taken shelter in their rover, but before they leave they detect a life form in the sea.

At Bay City, a town that was flooded due to global warming, the Mechanic, in a crab-like submarine, searches through the ruins of the Creighton-Ward building for a safe containing the plans for Parkmoor Scrubs prison so he can break the hood out. As he smashes his way through some of the debris collides with a rental sub hired by the Sullivan family causing it to crash onto the seabed. While Gordon and Kayo work together to rescue the family, Lady Penelope and Parker, using FAB 1's submarine mode, must reach the safe before the Mechanic gets there first.

When a transport ship carrying colonists heads straight into an asteroid belt, Thunderbird 3 is deployed to regain control.

Deep in the Mariana trench a survey team encounter the TV-21, a prototype Thunderbird vehicle designed and flown by Jeff Tracy. When a systems failure causes the survey sub to be stranded on the seabed, International Rescue arrives to rescue the crew, but the Mechanic suddenly takes control of the surveyor and uses it to crush Thunderbird 4. Gordon escapes just as his ship is destroyed and must find another way to rescue the crew. Meanwhile, Lady Penelope and Parker investigate into how the Hood is communicating with the Mechanic.