Trapped in the Sky is the ideal introduction to the world of Thunderbirds. It ticks all the right boxes on how to make an excellent first episode; it sets the scene well, we are introduced to the characters in a way that makes them instantly likable, and the rescue scene, which the whole episode has built itself up to, is the highlight of the episode. The script has a few plot holes, especially the failed rescue attempt by London Airport to remove the bomb, but you couldn't ask for a better start to the series.