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In page Buster Crabbe:

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Crabbe made regular television appearances, including one on an episode of the 1979 series Buck Rogers in the 25th Century, in which he played a retired fighter pilot named "Brigadier Gordon", in honor of Flash Gordon. When Rogers (Gil Gerard) praises his flying, Gordon replies "I've been doing that sort of thing since before you were born". Rogers (who was born more than 500 years earlier) responds "You think so?" to which Gordon replies "Young man, I know so". In fact, Crabbe had been playing "Buck Rogers" since long before Gerard was born.