TheupcomingfestivespecialwillseethereturnofoneoftheDoctor'sbiggestandmostfearedenemies-theDaleks.TheDoctorislockedawayinahigh-securityalienprison.Isolated,alone,withnohopeofescape.Faraway,onEarth,herbestfriends,Yaz,RyanandGrahamhavetopickuptheirliveswithouther.Butit'snoteasy.Oldhabitsdiehard.Especiallywhentheydiscoveradisturbingplanforming.AplanwhichinvolvesaDalek.