Planet X (disambiguation)

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.
 * Planet X (Risk Assessment) - a planet mentioned in the Torchwood novel, Risk Assessment.
 * Planet X (Planet X) - the planet featured in the Bernice Summerfield audio story, Planet X.
 * Planetoid X - the planet featured in the Doctor Who audio story, Last of the Cybermen.
 * Planet XXX - the planet mentioned in the Torchwood audio story, Through the Ruins.

Real world

 * Planet X (audio story) - the second story in The New Adventures of Bernice Summerfield Volume 3: The Unbound Universe.
 * Famine on Planet X (short story) - a short story in Doctor Who Annual 1979.