The Doctor and his companions are transported back in time by the Time Lords who have decided that the Daleks need to be destroyed. The Doctor's mission is to change history so that they have never existed. Soon they are separated and The Doctor and Harry are captured by the evil Elite of the mad scientist Davros, who is working to perfect his Mark 3 travel machine: the Dalek.
DVD Extras: Commentary with Tom Baker, Elisabeth Sladen, Peter Miles (Nyder) and director David Maloney. Genesis of a Classic. The Dalek Tapes - documentary. Blue Peter - a March 1975 item looking at a collection of Doctor Who models. Doctor Who 1976 Annual as a PDF. Radio Times Billings. Continuity Compilation. Photo Gallery. Production notes.