The TARDIS is the Umpteenth Customer at a hyperspace tollbooth, and the Doctor and Mel win a free vacation through time and space to Disneyland in AD 1959. Mel boards a Time Machine in the form of a bus (no, it's not a TARDIS). The Doctor follows in his Old Semi-Reliable. In 1959, the US launches a satellite which promptly collides with the bus, which makes an emergency landing just outside a Welsh holiday camp called Shangri-La. One of the other passengers is Delta, Queen of the Chimerons. She and her egg are the last of their kind, as the evil Bannermen have taken over her world.