Exiled to Earth and forbidden from travelling by his fellow Time Lords, the newly regenerated Doctor arrives in Oxley Woods accompanied by a shower of mysterious meteorites. Investigating these unusual occurrences is the newly-formed United Nations Intelligence Taskforce (UNIT) led by Brigadier Alistair Gordon Lethbridge-Stewart. Most puzzling of all is the attempted kidnapping of a strange hospital patient, a man with two hearts who insists that he knows the Brigadier. Compiles episodes 1-4 from "Doctor Who" series 7