The Underwater Menace (2)
S4, E20: Jamie and Ben are set to work in the mines, but are determined to find a way to escape. The Doctor discovers that Zaroff's mad plans will end up causing the destruction of the Earth.

S4, E20: Jamie and Ben are set to work in the mines, but are determined to find a way to escape. The Doctor discovers that Zaroff's mad plans will end up causing the destruction of the Earth.