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K-9 is the name of several fictional robotic canines in the long-running British science fiction television series, Doctor Who, first appearing in 1977. K-9 has also been a central character in three of the series television spin-offs: the one-off K-9 and Company, The Sarah Jane Adventures and K-9. Although not originally intended to be a recurring character in the series, K-9 was kept in the show following his first appearance because he was expected to be popular with young...

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