The Dark Planet

 has several meanings pertinent to the Doctor Who universe and the real world.

In-universe

 * Dark planets

Behind the scenes

 * PROSE: Dark Planet, a 2007 Decide Your Destiny book.
 * AUDIO: The Dark Planet, the first release in the fourth and final series of The Lost Stories.
 * PROSE: The Dark Planet, a short story first released in Doctor Who Annual 1971.