In which film did Marilyn Monroe play the character of Claudia Caswell?

'All About Eve' is a 1950 American drama film written and directed by Joseph L. Mankiewicz, and produced by Darryl F. Zanuck. It was based on the 1946 short story "The Wisdom of Eve" by Mary Orr, although screen credit was not given for it.

The film stars Bette Davis as Margo Channing, a highly regarded but aging Broadway star. Anne Baxter plays Eve Harrington, an ambitious young fan who insinuates herself into Channing's life, ultimately threatening Channing's career and her personal relationships. The film co-stars George Sanders, Celeste Holm, and features Gary Merrill, Hugh Marlowe, Thelma Ritter, Marilyn Monroe in one of her earliest roles, Gregory Ratoff, Barbara Bates and Walter Hampden.

Marilyn Monroe, relatively unknown at the time, was cast as Miss Claudia Casswell, referred to by DeWitt as a "graduate of the Copacabana School of Dramatic Art." Monroe got the part after a lobbying campaign by her agent, despite Zanuck's initial antipathy and belief that she was better suited to comedy. Angela Lansbury had been originally considered for the role.