This is a disambiguation page.
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Planet X may refer to:
In-universe
- Planet X (Famine on Planet X) - The planet featured in the Doctor Who annual short story Famine on Planet X (short story)
- Planet X (Risk Assessment) - A planet mentioned in the Torchwood novel, Risk Assessment (novel)
- Planet X (Planet X) - The planet featured in the Bernice Summerfield audio, Planet X
Real World
- Planet X (audio story) - the second story in The New Adventures of Bernice Summerfield Volume 3: The Unbound Universe.