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In December 1945, Gratien Gélinas stars with Miriam Hopkins in St. Lazare's Pharmacy, a play from Miklos Laszlo, directed by Eddie Dowling. The play is first staged at His Majesty's Theatre in Montreal, and later in Chicago for several months.
In 1956, Gélinas spent the season with the Stratford Shakespearean Festival where he played the characters of Doctor Caius in The Merry Wives of Windsor and of Charles VI in Henry V.
Gratien Gélinas has some minor roles in such films as Red, from Gilles Carle (1969), and Bonheur d'occasion, from Claude Fournier (1983). In 1984, Gratien Gélinas plays once more in Agnes of God, a film by Norman Jewison. In 1987, he plays an important character in Les Tisserands du pouvoir, a film by Claude Fournier.