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Cray was a planet which was twinned with Earth for publicity reasons in the 25th century. This caused embarrassment on Earth because of Cray's poor reputation and its ongoing civil war.

A rev was a measurement of time on Cray. It was equivalent to approximately 40 Earth minutes.

The Fifth Doctor and Nyssa visited Cray at some point during the 25th century. (AUDIO: The Game)

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