1/4 The Doctor returns to Gallifrey and races to prevent a tragedy.
4/4 The Doctor and Sarah suspect that Eldrad has not been entirely honest with them.
3/4 The hand has regrown into Eldrad, who demands that the Doctor return her to Kastria.
2/4 At a nuclear power station, the stone hand comes to life and seeks access to the reactor.
1/4 Sarah becomes possessed by the fossilized stone hand of an alien, Eldrad.