The Doctor finds his past selves being ripped away one by one. His past selves end on on his home planet, the world of Gallifrey. They discover that they are being transported to a place on Gallifrey called the Death Zone where Time Lords in a time long before Rassilon used to scoop up aliens from all over space and time to play deadly games with them. This was put to a end by the rise of Rassilon as the greatest of all the Time Lords. The 5 Doctors have to discover who is behind the plot.