Serial: KKK  Episode Nos. 304, 305, 306, and 307.  Title: Day of the Daleks

World War Three may be looming, and the politician most crucial to the peace process is attacked by what appears to be a ghost.  The Doctor's investigations point towards ghosts from the future, fanatical guerillas who are attempting to change their own history to prevent the world they know from being enslaved to the Daleks.

starring Jon Pertwee as Doctor Who, Katy Manning as Jo Grant, Nicholas Courtney as Brigadier Lethbridge-Stewart, Richard Franklin as Captain Yates, and John Levene as Sergeant Benton.. Written by Louis Marks, Produced by Barry Letts, and Directed by Paul Bernard.

Originally transmitted from 1 January 1972 to 22 January 1972 on BBC1.