John Francis Christopher Ducker, known professionally as John Leeson, was an English actor. He was known for portraying Bungle in Rainbow and voicing K9 in Doctor Who and spin-offs The Sarah Jane Adventures and K9. Leeson trained at the Royal Academy of Dramatic Art and had several theatre and television roles before his work in Doctor Who. Initially planned for one serial, K9 appeared in several seasons of Doctor Who's original run before returning in 2006, which led to further appearances i...

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