All seems ready for a major sale of impressionist paintings to be graced by a royal visit. But panic erupts in the boardroom when the pedigree of the Van Gogh - to be sold by the Russians - is questioned. When it causes a scene between the porters, Les and Mick, a respectable firm is forced to take drastic action to save the big day.

Many incarnations of the Doctors and their old companions are taken out of time and deposited in the Death Zone on Gallifrey. There, they must battle the Master, Daleks, Cybermen and Yeti in order to reach the Dark Tower and discover the Tomb of Rassilon.