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(During this period, he may have been summoned to fight in the Time War on Gallifrey.
There are also references to the fall of Time Lord civilisation which prefigures the novel The Ancestor Cell and the Time War of the new series.
During the Time War, the Eighth Doctor (Paul McGann) attempts to rescue a pilot named Cass whose spacecraft is crashing into the planet Karn.
The Twelfth Doctor makes his first uncredited appearance in the programme's fiftieth anniversary special, "The Day of the Doctor", when thirteen incarnations of the Doctor unite to save his home planet of Gallifrey from destruction during the Time War.