Transmitted originally: 5 January 1985 to 12 January 1985.
Lytton turns out to be in the employ of the Cryons, the native inhabitants of Telos, who are at war with the Cybermen. With the aid of Griffiths, one of his gang from Earth and two escaped prisoners, Stratton and Bates he attempts to steal the time vessel, but fails and is partially converted into a Cyberman. The Doctor is unable to save him, but manages to destroy the Cyber Controller. The Cryon, Flast sacrifices herself to destroy the Cyber base with a huge explosion.
This story features an number of continuity
references to earlier stories: 76 Totter's Lane, where the TARDIS was originally seen in '100,000 BC', Gustave Lytton from 'Resurrection
of the Daleks', the destruction of Mondas from 'The Tenth Planet', the tombs of Telos and the Cyber Controller from 'The Tomb of the Cybermen'
and the Cybermen in the sewers of London as in 'The Invasion'.
The TARDIS changes its outward appearance for the first time in the series' history, due to the
'repair work'on the chameleon circuit by the Doctor. It first takes on the form of a cupboard, then a pipe organ, an ornamental gateway and finally
back to the well-known police box exterior.
The Sixth Doctor Novelisations
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