Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait. Meet the new Doctor! See the Doctor regenerate! ...of the Tenth Doctor. Get the latest updates Next Time ...

Martha Jones summons the Doctor back to modern-day Earth, but an old enemy lies in wait. How scary is the episode? With Michelle Ryan. Stop the attack! Read exclusive adventures. Next Time ...

Doctor Who (1963–1996) — Season 12, The Sontaran Experiment: Part 1 Arriving on Earth, the Doctor, Harry and Sarah meet a group of stranded human colonists. BBC One ...