Ring of Fire - Part 1 / Ring of Fire - Part 2.Ring of Fire - Part 1: A powerful underwater seaquake turns a busy day for International Rescue into a perilous one, when it causes a research team to be trapped in an undersea lab. As they attempt to rescue them, they quickly discover a seismic de-stabiliser to be the source of the quake, and with Lady Penelope's help, learn the person responsible for this is the phantom figure known only as the Hood, who soon puts the world in danger, triggering more quakes along the notable feature of the Pacific Ocean, "The Ring of Fire."
Ring of Fire - Part 2: With more quakes occurring, John and Brains must track down the control source for the seismic de-stabilisers, in a race against time, after the Hood orders International Rescue and the World Council to give up the Thunderbirds. Meanwhile, Scott and Virgil race to Taiwan when one of the undersea quakes destabilises a solar collector dish in Taipei, causing the dish to be positioned in such a way that when the sun rises, it will reflect on the city and burn it to the ground.