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)
More levels! More adventure! And it’s now available on tablets!
Available on: DVD or Video download
From suppliers including: BBC Shop, iTunes
Where to buy