TheDoctor,analientimetravellerfromtheplanetGallifrey,istransportingtheremainsofhisnemesis,theMasterbacktotheirhomeworld.HowevertheMasterisnotasdeadastheDoctorthinks.TheMaster'sessenceescapesandsabotagestheTARDIS,theDoctor'stimemachinecausingittocrashlandinSanFransciscoonDecember30th1999.TheDoctorrequiresaberylliumato...