Classic sci-fi series. The Doctor arrives on an alien world and is taken captive by the savage Sevateem tribe, who believe he is 'the evil one'. Show more
Classic sci-fi series. With the Sevateem against him, the Doctor attempts to win their trust by facing the trial of the Horta. Show more
Classic sci-fi series. Penetrating the barrier with Leela, the Doctor enters the spaceship and discovers the truth about Xoanon. Show more
Classic sci-fi series. Determined to rectify his earlier mistake, the Doctor tries to repair Xoanon. But the computer refuses his help. Show more
The TARDIS returns to present day Earth, where Sarah is caught in a rock fall and becomes possessed by the fossilized stone hand of the alien Eldrad.
At the nuclear power station, the stone hand has come to life and is determined to gain access to the reactor core.
The hand has used the nuclear energy to regenerate itself into the female form of the alien Eldrad, who demands that the Doctor return her to the planet Kastria.
On the dead world of Kastria, the Doctor and Sarah begin to suspect that Eldrad has not been entirely truthful with them.