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Based on a novel by Kenneth Royce The XYY Man tells the adventures of a former cat burglar named William ""Spider"" Scott. British Intelligence decide he will be useful to them and recruit him into their ranks. The XYY refers to a man who has an extra male chromosome a conditon characterised by height and a violent temperament. This series introduced the character of George Bulman a police detective whose further adventures were shown in Strangers and Bulman