We start off with a shady character, the Hood, who wants to learn the secrets of International Rescue and sell blueprints to the highest bidder. He manages to find out through telepathic torture between him and his half-brother Kyrano, that International Rescue is set to start operations.
The Hood plants a bomb on the Air Terrainean's new hypersonic, atomic powered airliner in London in order to draw out International Rescue. He proceeds to inform London Air Traffic Control and informs them that the bomb will auto-detonate upon impact of landing. Commander Norman orders Captain Hansen and his co-pilot to return to the airspace over London airport.
An X-Ray shot taken shows that there is indeed a bomb aboard Fireflash. All seems hopeless, and to make matters worse; the shielding around the nuclear reactor in Fireflash needs servicing within two hours or else passengers will succumb to radiation exposure.
Kyrano's daughter, Tin-Tin, is just one of the crew and passengers now in mortal danger. John Tracy, who has been listening in to radio transmissions from the Thunderbird 5 space station, contacts Tracy Island with details of the threat. Jeff proceeds to dispatch Scott in Thunderbird 1 and Virgil in Thunderbird 2 with Pod 3.
Meanwhile Lieutenant Bob Meddings is able to convince Commander Norman to allow him to take a TX-204 Target carrying aircraft out to Fireflash to attempt to dislodge the bomb. Upon requisitioning a nearby TX-204, Meddings goes out to the Fireflash and is sent out on a target to attempt to board a hatch when opened, risking a 300ft fall. While Meddings successfully manages to enter the hatch, he cannot disarm the bomb. He falls from the Fireflash, where it seems his parachute has failed, though it thankfully opens a mere 20 something feet from the ground.
The last option that can be taken is for the Fireflash to land as normal and hope that the bomb fails to detonate. However, a craft going at 1.5,000mph is detected, which is Scott in Thunderbird 1. Scott introduces himself as part of International Rescue and is equipted to help them out. Scott lands at London airport and requests Police to protect TB1. Despite suspicsion, Scott is able to persuade Norman to permit International Rescue's assistance. Police cars are dispatched as protection, one of these officers is the Hood in disguise in order to take photos of the Thunderbird craft.
There is 30 minutes before Fireflash's Radiation Safety Factor expires and 20 minutes before Thunderbird 2 arrives, thus giving IR 10 minutes to initiate the rescue. Meanwhile the Hood takes photographs of the IR craft. The Automatic Camera Detector unit alerts Scott and police cars set off along the M1 in pursuit of the absconding Hood whilst Thunderbird 2 arrives and unloads three Elevator Cars, two of which will be remote-controlled from his master vehicle.
The police lose the Hood, so Scott alerts their London agent, Lady Penelope to track down the Hood. Meanwhile Fireflash only has 5 minutes left when the Elevator Cars are ready. Fireflash will be guided to land on top of the cars to reduce the likelihood of a detonation. Virgil notices a fault on #3 Elevator Car, which inexplicably clears itself.
The cars speed to intercept the approaching Fireflash along Runway 29, but when the 3rd Car crashes due to its fault, Virgil is forced to abort the first rescue attempt and bring out a reserve car. Fireflash begins a second approach and manages to make contact with the cars. When he applies the brakes, Virgil loses control of his vehicle and flips into a trench, but survives unhurt. Meanwhile, Fireflash grinds to a halt before it reaches the end of the tarmac, saving the crew and passengers from the radiation and avoiding a detonation.
After all is safe, the attention is turned to the the intruder on board Thunderbird 1 again. Lady Penelope and her butler, Parker, pursue the Hood in FAB1 and blast their opponent off the M1 with the Rolls-Royce's built-in machine gun. Although the Hood survives, his photographs are ruined. On Tracy Island, Jeff has a doctor confirm that Kyrano is still in good health. The topic of the conversation soon shifts to the Fireflash incident and the doctor mentions how he would be honoured to shake International Rescue's hand. With a parting handshake, Jeff grants the oblivious doctor his wish, before announcing to his sons, "Boys, I think we're in business."
All in all a wonderful episode and a first episode that couldn't be a better one that a series could ask for. Granted the episode is slow moving thanks to the pedded areas from the original 30 minute piece, even those pieces are real fantastic and flow well into the episode.
The voice acting in this episode alone is fantastic and the effects are quite ahead of its time (somewhat as ahead times go with fake movie making a.k.a CGI). This episode was fantastic in plotline and it introduces a lot, thus I give this episode a 10/10 rating.