Following the earth shattering news that their father may still be alive, the Tracy brothers embark on their most personal rescue yet. It's a mission that will require the combined assembly of every Thunderbird, not to mention the aid of International Rescue's old friend , The Mechanic, and it won't be made easier by interference from The Hood and his Chaos Crew. This dangerous undertaking will leave Tracy Island vulnerable to a devastating attack, but the rewards could far outweigh the risks in the most emotional and moving chapter yet of THUNDERBIRDS ARE GO!