The A to Z Of Doctor Who

G is for...

Ghosts

The Doctor has encountered a number of beings believed to be ghosts, though all have actually turned out to be something else.  These have included time-travellers from the 22nd century, the Guelph, Cybermen and another time-traveller stuck in a pocket universe.  On one occasion, the Doctor and Jo also briefly met their own future selves, which the Doctor speculated were ghosts of a kind.  Sarah Jane once investigated a haunted house in which the life-forces of its past inhabitants had been trapped by alien technology, and the Torchwood team found a hospital in which the present and the past were linked, producing the effect of it being haunted.