Christmas on a Rational Planet

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Christmas on a Rational Planet

Author	Lawrence Miles
Cover artist	Mike Posen
Series	Doctor Who book: Virgin New Adventures
Release number	52
Subject	Featuring: Seventh Doctor Chris, Roz
Publisher	Virgin Books
Publication date	July 1996
ISBN	0-426-20476-X
Preceded by	GodEngine
Followed by	Return of the Living Dad

Christmas on a Rational Planet is an original novel written by Lawrence Miles and based on the long-running British science fiction television series Doctor Who. It features the Seventh Doctor, Chris and Roz.

It also contains the first casual reference to the Faction Paradox, which become an important element in the BBC books Eighth Doctor Adventures and subsequent spin-off series, and an explicit explanation that the mark carried by the Third Doctor during his exile on Earth was a branding used to distinguish criminals by the Time Lords (in reality, this mark was a tattoo of a cobra that Jon Pertwee picked up while serving in the Royal Navy).