A geological survey team gets trapped when a huge earth-breaking vehicle, controlled by a villain known only as the Mechanic, causes them to fall into a narrow crevice. As International Rescue mobilise, Lady Penelope and Parker visit the Hood in Parkmoor Scrubs prison to find out more about this mysterious new villain.

A distress call from an interstellar ship called EDEN leads Alan and John to explore the wreckage. There they find space pirates and mysterious spider-like robots known as Builder Bots.

Thunderbird 3 is called out to Europa, a moon of Jupiter, when a pair of documentarians fall into an ice ocean, leading Alan to make first contact with an alien lifeform.

A family becomes trapped in a city that is being overtaken by rising ocean tides.

When a transport ship carrying colonists heads straight into the asteroid belt between Mars and Jupiter, Thunderbird 3 is deployed to regain control.

Gordon ventures deep into the Marianas trench to rescue a survey team, and ends up discovering an early International Rescue prototype vehicle once flown by Jeff Tracy. Gordon takes Thunderbird 4 down to save the crew and get a better look at the prototype. But the survey ship, designed by The Mechanic, transforms and wrecks Thunderbird 4. Gordon is forced to abandon ship and seek refuge on his dad's TV-21 plane. To save the survey crew, Gordon powers up the plane and manages to take it up to the surface.

After the Mechanic flees the scene with the TV-21, Scott is in hot pursuit. But, when the villain steals some volatile iridium, Brains must make drastic alterations to Thunderbird 3 to save the day.

When seismic activity near the coast of Greece reveals the lost city of Atlantis, two scientists venture below the depths to explore the area. But when their submarine becomes stuck, International Rescue are called out to assist.

A comet brought into the Earth's orbit takes a wrong turn. International Rescue must intervene to stop it from colliding with the planet - and the space station between them.

Scott attempts to rescue a mysterious balloonist when his hot air balloon crashes on the top of a mountain.

The team travels to Langstrom Fischler's newest invention to stop a hive of malfunctioning weather drones.

The Tracys receive a distress call from the crew of a cargo zeppelin. A giant loading claw malfunctioned and has started attacking anything that moves. Thunderbird 1, 2, and Shadow launch out in an attempt to land the ship safely. But the zeppelin contains a dangerous fuel source and there are still crew members trapped near the loading claw. Scott makes it to the cockpit of the zeppelin while Virgil begins to offload the fuel source. Kayo puts on a mech suit to deal with the loading claw while the crew escape. Ultimately, they put the zeppelin down outside city limits and escape just before it explodes.

A mysterious tunnelling vehicle leaves a worker trapped in its wake and it is up to Gordon and Virgil to free him. Meanwhile, Parker and Penelope track down the digger and discover an old foe at the controls.

An eccentric scientist calls Brains out to a volcano that he believes will soon erupt.

The Mechanic takes over the Grand Sequoia Dam, leading all of International Rescue to intervene and stop him.

When an orbiting solar energy station malfunctions, International Rescue must deal with both the station and a passing airliner carrying precious cargo.

Gordon must rescue TV documentarians Buddy and Ellie Pendergast
from a mysterious valley full of strange creatures.

Virgil and Grandma are out resupplying Thunderbird 2 when a distress call comes in. A mine is in danger of collapsing in the desert. When Virgil goes to help the workers, he gets caught in a massive sandstorm and it is up to Grandma to save the day.

When an atmospheric cleaning machine malfunctions, trapping the maintenance crew inside, Parker must square off with a figure from his misspent youth.

Lady Penelope brings John as her guest to a charity event while Gordon and Alan take the watch aboard Thunderbird 5.

All of International Rescue take a retreat to test out some new equipment at their family ranch off the main island. Equipment malfunctions alert them to the presence of an intruder, which Lady Penelope and Parker track down in FAB1.

Conrad, a young traffic controller, makes a slight error which ends in catastrophe aboard the orbiting Spacehub transit terminal. Alan launches Thunderbird 3 and is able to buy Conrad time.

Lady Penelope, Parker and Kayo arrive on the scene of a massive semi-submersible ocean oil rig to decommission the polluting relic, but supervisor Malloy has other plans.

When the first run of an inventor's newly-constructed hyperloop begins to malfunction, Scott must try to find a way to slow down the fast-moving ride.

The Mechanic finally completes Project Sentinel and puts its destructive capabilities to the test by making The Hood his first target. As the International Rescue team scrambles to save an old foe Brains and MAX, using Thunderbird 5's space elevator, embarks on a dangerous mission to shutdown the satellite and neutralise the Mechanic once and for all.