State of Change is an original novel written by Christopher Bulis and based on the long-running British science fiction television series Doctor Who. The novel features the Sixth Doctor and Peri, although the dimensional instability of the realm they are currently visiting causes the Doctor to briefly regress through his first five incarnations; the Sixth Doctor also spends a great deal of time allowing the personality of the Third Doctor to take control of his body when he is forced to fight.

State of Change
Cover Art
AuthorChristopher Bulis
SeriesDoctor Who book:
Virgin Missing Adventures
Release number
5
SubjectFeaturing:
Sixth Doctor
Peri
Set inPeriod between
Revelation of the Daleks and
The Trial of a Time Lord
PublisherVirgin Books
Publication date
December 1994
ISBN0-426-20431-X
Preceded byThe Crystal Bucephalus 
Followed byThe Romance of Crime 

Plot

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10 BC. The Doctor and Peri land in ancient Rome, specifically in the tomb of Cleopatra. But something is very wrong: The tomb walls depict steam-driven galleys and other disturbing anachronisms. The time travellers discover that Rome has advanced far beyond its natural means, and they must recruit the aid of Ptolemy Caesar to prevent his half-siblings, Alexander Helios and Cleopatra Selene II, from waging a potentially world-ending war with each other. But the anomalies don't just end with Rome, as The Doctor and Peri experience changes of their own...

Continuity

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It is implied at the end of the novel, when the Dominion is transported to a newly created duplicate of Earth in a distant star system, that this is the same planet as Mondas - the eventual home of the Cybermen.

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