 Some master performances by Wållgren on stage include her Sorel Bliss in Noël Coward's "Hay Fever" in 1937, Celia in Shakespeare's "As You Like It" 1938 (directed by Alf Sjöberg), the strong portrayal of Curley's wife in the original Swedish staging of John Steinbeck's "Of Mice and Men" in 1940, Iphigenia in Goethe's "Iphigenia in Tauris" 1941, her Ophelia in the classic 1942 staging of "Hamlet" (opposite Lars Hanson in the title role), Mary Grey/Joan of Arc in "Joan of Lorraine" by Maxwell Anderson in 1948, Catherine Sloper in "The Heiress" by Ruth and Augustus Goetz in the 1950/51 season, Indra's daughter in the Olof Molander-staging of Strindberg's "A Dream Play" 1955, Nina in Chekhov's "The Seagull" 1955, Masha in Chekhov's "Three Sisters" 1958, Isabella in Shakespeare's "Measure for Measure" 1958, Nora in Ibsen's "A Doll's House" 1962, Gerda in Strindberg's "Storm" 1964, Mrs. Alving in Ibsen's "Ghosts" 196?, the grand portrayal of Madame Liubov Andreievna Ranevskaya in "The Cherry Orchard" by Chekhov in 1967, Martha Brewster in "Arsenic and Old Lace" in 1970, the title role of "Agnes" in Kent Andersson's 1972 play, Lena in Fugard's "Boesman and Lena" 1977; and the role of Ethel Thayer in "Sista sommaren" (play based on the Oscar-winning film "On Golden Pond", starring Katharine Hepburn in the same part) in 1981.Her film debut came with "Sonja" in 1943, but her break-through came with "Kvinnor i fångenskap" the same year, where Wållgren portrayed a young prisoner on the run.Being "of the theatre" Gunn Wållgren filmed sporadically during her life.