The Guinea Pig is a three-act play by Warren Chetham-Strode. The work premiered in London's West End at the Criterion Theatre in 1946, starring Rachel Gurney as Lynne Hartley. Following its successful sixteen month run, the play was adapted into a 1948 film, starring Richard Attenborough and Sheila Sim.

Original West End cast Dennis Stringer, M.A. – William Mervyn Fitch – George Bryden Grimmett – Denholm Elliott Knox – Roger Braban lloyd Hartley, M.A. – Cecil Trouncer Lynne Hartley – Rachel Gurney Mr Read – Duncan Lewis Mrs Read – Joan Hickson Mrs. Hartley – Edith Sharpe Nigel Lorraine, B.A. – Robert Flemyng Read – Derek Blomfield

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