Television adaptation of the novel by R.L. Stevenson about the upright Dr Jekyll whose experiments lead him to discover a way to separate out good and evil in a man, and lead to him becoming the persona of the immoral Mr Hyde when taking the substance. However, he finds that the splitting begins to occur of its own accord and he loses control over it.

The TARDIS arrives in a desolate future London, where the Doctor discovers his old enemies the Daleks have taken control of Earth.

Two men go into business supplying medical colleges with cadavers by robbing graves.

A look at the making of the Doctor Who story 'The Dalek Invasion of Earth' (1964)