Stories set in the 4999999990s is an out-of-universe category. Don't put it in an in-universe category like category:4999999990s or any category that doesn't have the word stories or sources in it. Categories about sources should only be in other categories about sources.
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Cassandra O'Brien.Δ17 -
List of Doctor Who television stories -
Sixteenth Doctor -
Fifteenth Doctor -
The Collection -
Clara Oswald -
River Song -
Eleventh Doctor
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