Doctor Who: Castrovalva (TV)

While the Doctor tries to recover from an unstable regeneration, the Master sends the TARDIS hurtling back in time to the Big Bang, where it will be torn apart. Adric, Nyssa and Tegan manage to save the time machine and find themselves arriving on Castrovalva, an ancient place legendary for its serene atmosphere. There they hope that the Doctor will be able to recuperate from his recent trauma. But the Master is lurking on Castrovalva, and it soon becomes clear that he has drawn the time travellers into a trap from which there may be no escape.