Brigadier Lethbridge-Stewart

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