In a family of heroes, young Alan Tracy (Brady Corbet) is always being left out. While his father, billionaire and former astronaut Jeff Tracy (Bill Paxton) and his four elder brothers are busy saving the world, Alan's biggest challenge is saving his grade point average at boarding school. And what's worse, he can't even tell his schoolmates that his dad and brothers are better known as the fearless adventurers behind the top-secret organization International Rescue – called in to save those in need whenever disaster strikes. Alan dreams of joining his family one day in their global vocation and even getting into the driver's seat of one of the awesome, incredible machines the Tracy's utilize in their life-saving work: the Thunderbirds. Back home on Tracy Island - a secret oasis in the South Pacific and headquarters to International Rescue – Alan and his friends, the brainy Fermat (Soren Fulton) and the adventurous Tin-Tin (Vanessa Anne Hudgens), are left behind again as his fearless father and brothers are deployed on a fake mission by their arch nemesis The Hood (Sir Ben Kingsley). The master criminal takes control of Tracy Island and the Thunderbirds, and this time it falls to Alan and his friends to come up with a plan to defeat The Hood and rescue his family… oh, and save the world while they're at it.