Brigadier Lethbridge-Stewart started off life in the weird and unpredictable world of Doctor Who as a colonel in the Scots Guards. After the incident with the Yeti and the Doctor, he shortly saw promotion to Brigadier and found himself transferred to the United Nations Intelligence Taskforce.
UNIT was set to investigating a company called International Electromatics, which turned out- small surprise- to be a front for a Cyberman invasion of Earth. If ever he thought he might conceivably achieve a nice, simple career path through the military, that promotion was very definitely the end of it. From then on, the Brigadier's career would inevitably be dominated by strange phenomena, super science, and all manner of alien peculiarities they never did get around to teaching anyone about in basic training.
Thankfully he had the assistance of the Doctor as UNIT's scientific advisor, or God alone knows what might have happened- especially since at first, his natural skepticism and by-the-book ways led him into all sorts of conflicts with the patently impossible happening around him. He did eventually get over the tendency to respond to any bizarre or unusual threat by shooting at it- not to say that it didn't take quite some time to get him to that stage!- but for all that you could never say he was anything less than solid, or anything other than genuinely brave in the face of the impossible.
The Brigadier is from Doctor Who, and is the property of the BBC. He appears here solely for the purpose of role-playing in milliways_bar, from which no profit whatsoever is being made.