2 January 1971
Roger Delgado (The Master), Nicholas Courtney (Brigadier Lethbridge-Stewart), Richard Franklin (Captain Mike Yates), John Levene (Sergeant Benton) [1-2, 4], Michael Wisher (Rex Farrell), Harry Towb (McDermott) [1-2], David Garth (Time Lord) , Frank Mills (Radio Telescope Director) , Christopher Burgess (Professor Philips) [1-2], Andrew Staines (Goodge) , John Baskcomb (Rossini) [1-2], Dave Carter (Museum Attendant) , Stephen Jack (Farrell Senior) , Barbara Leake (Mrs. Farrell) [2-3], Roy Stewart (Strong Man) , Dermot Tuohy (Brownrose) , Norman Stanley (Telephone Mechanic) , Bill McGuirk (Policeman) , Terry Walsh (Auton Policeman)  Pat Gorman (Auton Leader), Haydn Jones (Auton Voice) [3-4].
|Written by||Robert Holmes|
|Directed by||Barry Letts (uncredited)|
|Produced by||Barry Letts|
The Earth is in terrible danger! The Master has arrived with an evil scheme to destroy humanity and silence The Doctor forever. His plan? To awaken the awesome power of the Nestene – a ruthlessly aggressive alien life form. With their control over all types of plastic, they form into faceless automatons, a willing army of destruction easily controlled by the evil Time Lord himself. This is the terrible threat now facing Earth – the terror of the Autons.
Aided by the Brigadier and his enthusiastic new assistant, Jo Grant, only The Doctor can combat their evil power, but this is easier said than done when every plastic doll, phone flex, or chair can be turned against him. First, however, he must defeat The Master.