The TARDIS arrives on a planet where a race known only as the Aliens have gathered soldiers from a number of different wars in Earth's history, brainwashed them and put them to battle. Their aim is to form an invincible army from the survivors and use this to take over the galaxy. Patrick Troughton (the second Doctor) stars along side Wendy Padbury and Frazer Hines who play his companions Zoe Heriot and Jamie McCrimmon. This classic story reveals the origins and background of the Time Lords.
Whovian facts - It is the 50th story of the series, and the last Doctor Who serial to be recorded in black and white.