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The Avengers: Square Root of Evil (S1EP3 ITV 21 Jan 1961, George Murcell)



Square Root of Evil: Steed impersonates Riordan, a forger soon to be released from prison, and gains the trust of gang-leader Hooper. Things seem to be going well until Hooper’s second-in-command, known as the Cardinal, announces that Riordan’s girlfriend is outside waiting to see him.

Regular Cast: Patrick Macnee (John Steed), Ian Hendry (Doctor David Keel)

Guest Cast: Ingrid Hafner (Carol Wilson), Michael Robbins, Alex Scott, Heron Cavic, Cynthia Bizeray, George Murcell, Vic Wise, Delphi Lawrence

Writer: Richard Harris / Director: Don Leaver

Airdate: 21 Jan 1961 on ITV

Series: The Avengers Season 1 Episode 3