Earth, the near future. Diplomat Sir Reginald Styles has started seeing ghosts at his country mansion - an alarming development given the precarious international situation and his position as possibly the only man capable of stopping the Third World War. The Doctor and Jo go ghost hunting - but are these ghosts from the past or the future?
Elenco: William Hartnell , Patrick Troughton , Jon Pertwee , Tom Baker , Peter Davison , Colin Baker , Sylvester McCoy .