Now, Elliot’s life will be portrayed on the big screen, with the upcoming film My Mama, Cass. The film, starring Baby Reindeer‘s Jessica Gunning as Elliot, is based on a 2024 memoir by Elliot’s daughter, Owen Elliot-Kugell, who was just seven when her mother died in 1974. “I’ve wanted to tell her story for a really, really long time, and I didn’t know how to do it,” Elliot-Kugell told us in an exclusive interview ahead of the memoir’s publication. “I can’t believe we’re still talking about the sandwich after all these years,” Elliot-Kugell told us. Elliot’s bandmate Michelle Phillips has also been trying to make a Mamas and Papas biopic for decades.