Nicholas Courtney (born William Nicholas Stone Courtney; 16 December 1929 - 22 February 2011) played first Colonel and then Brigadier Alistair Gordon Lethbridge-Stewart, beginning in The Web of Fear and finally in Battlefield. He reprised the role in the fan video Downtime (later adapted into one of the Virgin Missing Adventures), the spin-off program The Sarah Jane Adventures and audio dramas for the BBC and Big Finish Productions.