Jo attempts to rescue the Doctor who is being held prisoner by the Master and Trenchard. The Master plans to summon the Sea Devils from beneath the waves.
Share this with
See all episodes from Doctor Who
See all clips from Part 3
See all broadcasts of Part 3 (2)
More levels! More adventure! And it’s now available on tablets!
Available on: DVD or Audio download
From suppliers including: Amazon, Audible.co.uk, BBC Shop
Where to buy
See all galleries from Part 3