Tracy Island not only houses Jeff Tracy and his five sons, but also serves as headquarters for the top-secret International Rescue organization. A criminal mastermind known only as "The Hood" manages to get past the island's security measures and trys to take over International Rescue. His goal is to steal the five most advanced rescue vehicles and use them for his own agenda. With Jeff and his four eldest sons on a mission, there's only one person with any hope of stopping the takeover - the youngest son, Alan, who vows to save his family and keep the Thunderbirds alive.