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Official Site: BBC

Brigadier Sir Alistair Gordon Lethbridge-Stewart , generally referred to simply as the Brigadier, is a fictional character in the British science fiction television series Doctor Who, played by Nicholas Courtney. He is one of the founders of UNIT (United Nations Intelligence Taskforce), an international organization that defends Earth from alien threats, and serves as commander of the British contingent.

Almost 20 years after his last appearance, the character returned in the spin-off series The Sarah Jane Adventures in late 2008. Following Courtney's death in 2011, however, the Brigadier was retired through a line of dialogue in the Doctor Who episode "The Wedding of River Song"; the Doctor is informed by telephone that the Brigadier died peacefully in his sleep.

The 2012 episode "The Power of Three" officially introduces the Brigadier's daughter, Kate Stewart, as UNIT's scientific adviser. She was originally introduced in the unlicensed video spin-off Downtime in 1995, in which the Brigadier also appeared.

Alistair Gordon Lethbridge-Stewart was born in Scotland, according to dialogue in Terror of the Zygons. He first encounters the Second Doctor in The Web of Fear (1968), when Lethbridge-Stewart is a colonel commanding a British Army detachment sent to investigate the Yeti in the London Underground. By his next appearance in The Invasion (1968), he had been promoted to Brigadier and was working with UNIT. When the Doctor was forcibly regenerated and exiled to Earth, Lethbridge-Stewart gave him a position as UNIT's scientific advisor after he helped defeat the Auton invasion. Other military members of UNIT included Captain Mike Yates, Sergeant Benton and Royal Navy Lieutenant Harry Sullivan.

Brigadier Lethbridge-Stewart has not been a contender in any CBUB matches.