Brian Clemens
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Brian Clemens (born 1931 in Croydon, England) is a screenwriter and television producer, possibly best known for his work on The Avengers and The Professionals. He has also contributed to Bergerac, The Baron, Bugs, The Champions, Thriller, and several incarnations of the Highlander series. In the early 1970s he produced the Hammer films Dr. Jekyll and Sister Hyde and Captain Kronos, Vampire Hunter.