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Lieutenant Beresford was the UNIT officer brought in to replace Yates when he was promoted to Captain. (PROSE: The Face of the Enemy) Years later, when he had been promoted to Major, he was in charge while Brigadier Lethbridge-Stewart was in Geneva. He was summoned by Sir Colin Thackeray to deal with the threat of the Krynoid which had been Arnold Keeler. On the Fourth Doctor's advice, he called in an aerial attack to bomb the Chase Mansion, destroying the Krynoid. (TV: The Seeds of Doom)