plummer had his first broadway role in january 1953 in "the starcross story". his next broadway role, "home is the hero", lasted from september to october 1954. plummer was tyrone power's understudy. after acting in "night of the auk", plummer was in elia kazan's broadway play "j.b.". he played jason in robinson jeffers' version of "medea" in paris in 1955. also in 1955, he played mark antony in "julius caesar". he also played ferdinand in "the tempest" at the american shakespeare festival.