Plummer began acting at the Stratford Shakespeare Festival in 1956. He played the main character in "Henry V". He played the main role in "Hamlet" and Sir Andrew Aguecheek in "Twelfth Night" in 1957. The next year, he played Leontes in "The Winter's Tale", Bardolph in "Henry IV, Part 1", and Benedick in "Much Ado About Nothing".
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