Doomwatch· Season 2 · Episode 5
By the Pricking of My Thumbs...
The Doomwatch team investigates the myth about the XYY chromosome after a schoolboy is expelled for possessing it.
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Guest stars
Vivien Sherrardas Barbara Mason
John Nolanas Geoff Hardcastle
Olaf Pooleyas Dr. Ensor
Colin Jeavonsas Botting
Jean Trendas Dr. Fay Chantry
Barry Stokesas Stephen Franklin
Sally Thomsettas Judy FranklinMartin Howellsas Gerald Jenkins
David Jansonas Arnold McPhersonRobert Yetzesas PaintonDavid Jarrettas Tom Avery
Bernard Heptonas Oscar Franklin
Patsy Byrneas Mary FranklinPatrick Milneras Airport Policeman
John Nolanas Geoff HardcastleOlaf Pooleyas Dr. EnsorColin Jeavonsas BottingJean Trendas Dr. Fay ChantryBarry Stokesas Stephen FranklinSally Thomsettas Judy FranklinMartin Howellsas Gerald JenkinsDavid Jansonas Arnold McPhersonRobert Yetzesas PaintonDavid Jarrettas Tom AveryBernard Heptonas Oscar FranklinPatsy Byrneas Mary FranklinPatrick Milneras Airport Policeman