A powerful seaquake turns a busy day for International Rescue into a perilous one. Lady Penelope helps Thunderbirds find who put seismic destabilisers on the sea bed.

As the team continue their quest to save the researched, Lady Penelope is on the trail of their adversary.

Alan is on space junk duty, when one of the pieces of debris turns out to be a heat-seeking SAT-MINE that activates and locks onto TB3's heat signature. Back on Earth, Lady Penelope and Parker implement a plan to sneak into a top-secret storage facility.

Thunderbird 5 picks up an unusual radiation spike from a remote corner of Africa, and Scott rushes in with Thunderbird 1 to check it out. Using special equipment, Scott enters the mine and discovers the source to be a leak of unstable uranium. Moments later he is attacked by a mysterious woman who claims that the mine belongs to her family. During their confrontation, the mine begins to crumble - and Scott and she must find a way out.

Kayo is riding aboard Fireflash, a supersonic airliner invented by Brains, but she is unaware that its controls have been tampered with. International Rescue notices the plane has vanished from their monitors and attempt to locate it. Kayo realises that the plane is flying in the wrong direction, and manages to avoid a powerful gas attack that has knocked out both passengers and crew.

An anti-technology group calling themselves The Luddites power up an electromagnetic pulse device underneath London, crippling everything that uses electricity. The result is a near catastrophe as the entire city shuts down. Virgil and Grandma Tracy must find and disable the device - with the help of Lady Penelope and Parker.

A strange malfunction occurs on a high-speed train in Japan, leaving it out of control and unable to stop. Brains comes up with a plan to fix the problem before a disastrous crash occurs - the only problem is that he will have to board the speeding engine himself to pull it off. Scott manages to get the genius on board, where they find the problem is more complicated than they thought.

A series of cascading equipment failures leads John to realise that rogue A.I. has gained control of Thunderbird 5. The programme is sending false monitor images to Tracy Island to deceive the other brothers. John finally gets through to Lady Penelope and informs her of the situation. Once the other brothers figure out what is going on, Alan is despatched in Thunderbird 3 to rescue John.

A malfunction at a mining operation sends an asteroid careening towards the sun, endangering crewman Ned Tedford. Alan and Kayo deploy Thunderbird 3 for the rescue mission, but a rogue solar flare knocks out their sensors. They land near the mine, and must find a way to alter the asteroid's trajectory so that it slingshots around the sun instead of crashing into it.

Lady Penelope, Parker and Gordon visit the Amazon desert, where an archaeologist shows them round an ancient temple. When they all become trapped inside, the academic refuses to let them call for help, fearing for his reputation - so the trio of heroes must put their wits to the task of finding an escape route.

International Rescue scrambles all the flight-capable Thunderbirds to rescue the crew of CIR.R.U.S, a high-atmosphere weather station, now in danger due to the arrival of a fierce storm. TB1, TB2 and TB3 are quickly crippled by the conditions, and the only hope of salvaging the mission lies with TB5 - and John's ability to mount his most daring rescue ever.

A giant heavy metal extraction plant, moving along the Pacific seabed and collecting toxic waste, has a sudden compartment fire, leaving it out of control and heading for a undersea chasm. Thunderbird 2 is dispatched with Thunderbird 4 to effect the rescue of the only crewman, Ned Tedford once again, and make safe the toxic waste it is carrying. Lady Penelope, meanwhile, investigates the company that owns the extraction plant, when both John and Gordon suspect the owner was more concerned for the cargo, than the crew, and soon has trouble from the Hood.

Brains and Alan visit the Quantum Research Center, adjacent to New Geneva in Switzerland, to see the Supreme Hadron Collider switched on. Disaster strikes when the collider is switched on, creating a gravity well. A satellite is sucked down into downtown New Geneva, and International Rescue is mobilised when an aircraft and the World Wide Space Station are drawn into the gravity well, threatening the city. The only craft that can withstand the gravitational pressure is Thunderbird 4, used out of its normal undersea environment.

The Estrella Grand is a self-constructing luxury hotel, designed by Brains, which orbits around Earth. The hotel suffers a mysterious hull breach that will not repair itself causing it to begin to fall to earth. Thunderbirds 2 and 3 are launched to rescue the guests including Lady Penelope and Parker. Kayo flies with Thunderbird 3 to board the hotel in search of a saboteur. Note: This episode is a homage to the original Thunderbirds episode, Ricochet (satellite crashing to Earth).

Concerns arise when a meteor shower is projected to hit the decommissioned Shadow Alpha One moon base, and attempts at contacting the lone crew member, Captain Lee Taylor, are unsuccessful. Scott and Alan take Thunderbird 3 on a rescue mission and Scott boards the base and finds Taylor attempting to maintain the base and it's defence system against meteors. After initial attempts to defend the base, against continuing waves of meteors, Scott and Taylor are forced to abandon the base to meet Thunderbird 3 at a rendezvous on the moon's surface that itself is threatened by the meteor shower. Guest Star: Rich Hall as Captain Lee Taylor.

Virgil attempts to rescue a mining crew trapped inside a glacier, but the scientist in charge of the project refuses to leave.

International Rescue are dispatched to save one of their own when the Hood traps Lady Penelope and Parker inside an underwater hyper-train loop during a high-stakes robbery.

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A seismologist and his son alert the authorities to the presence of a rogue wildcat mining operation, only for the machinery to trigger an earthquake that swallows the equipment - along with the father and son. Gordon must attempt a daring underground rescue of the boy and his injured father, while Virgil has to find a way to shut down the out-of-control rig.

A scientist accidentally locks herself inside a vault which is being used to store unstable matter. There is only one person who has successfully broken into a vault like this - Parker. Colonel Casey of the GDF recruits Parker for the job, but the safe cracker ends up locking himself and Lady Penelope inside as well. Virgil and Scott transport the vault to an isolated area on Thunderbird 2, where Parker and Penelope must try and free themselves and the scientist before the anti-matter explodes. Note: This episode is a homage to the original Thunderbirds episode, Vault of Death

Halley's Comet is passing close to Earth. Businessman Francois Lemaire, on an ego trip sending live pictures back to earth, with his unimpressed wife Melanie on board his space yacht the Solar Wind. They fly into the comet's tail and the ship is damaged losing communications. John in Thunderbird 5 monitoring the situation despatches Thunderbird 3 with Alan and Scott to look for survivors. Alan is particularly excited to be going to Halley's comet.

Lady Penelope's Great Aunt Sylvia visits Creighton-Ward Manor for afternoon tea, but has something important to discuss... Guest Star: Sylvia Anderson as Great Aunt Sylvia.

During a joint operation between International Rescue and the Global Defence Force, a series of mishaps nearly ends in disaster. In the wake of the botched mission, Colonel Martin Janus takes over the GDF...

A facility known as CATCH, from where all air traffic in North America is controlled is sabotaged and Scott and Virgil handle a rescue mission involving a mid-air plane collision while Kayo infiltrates the facility using Thunderbird Shadow. Kayo discovers that this is a diversion and part of a much bigger plan by the Hood. Disregarding Scott and John's instructions regarding International Rescue's mission to save people and not act as policemen she puts herself in danger and is saved by an unlikely source.

An undercover operation involving Lady Penelope and a Parker to recover a stolen Repulser Magnetic Array for the Global Defence Force gets blown prematurely. Parker is taken prisoner by Banino using the power of the Repulser and he takes a stolen GDF flyer with Kayo, who was secretly acting as back-up, in pursuit in Thunderbird Shadow. The flyer crash lands on a factory roof and International Rescue intervene with Scott in Thunderbird 1 rescuing one of the factory workers and Lady Penelope saving Parker. Kayo confronts Banino to find he knows her secret; she lets him escape knowing she will have to reveal the truth of her past.