The Zero Room is gone and the Doctor's regeneration is dangerously unstable. To help him, Tegan locates the tranquil world of Castrovalva and the TARDIS heads there.
Share this with
See all episodes from Doctor Who
See all clips from Part 2
See all broadcasts of Part 2 (2)
For the latest news, photos, videos and more, follow us on:
Find out what the TARDIS has on file about Missy/The Master.
Create and play your own amazing adventures in time and space!
Available on: DVD or Video download
From suppliers including: BBC Store, iTunes
Where to buy