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Appearances
The XYY Man
Guest cast, played by William Squire
- Episode 2x01: Friends and Enemies (Jun 27, 1977)
- Episode 2x02: The Missing Civil Servant (Jul 4, 1977)
- Episode 2x03: The Big Bang (Jul 11, 1977)
- Episode 2x04: At the Bottom of the River (Jul 18, 1977)