The 1923 cast of the Yellowstone spinoff expands the Dutton family tree and includes renowned actors like Harrison Ford, Helen Mirren, and Timothy Dalton. Set during a challenging time in Montana's history, the show follows the Duttons as they struggle to maintain their ranching empire amidst various hardships. The spinoff aims to reveal the secret history of the Duttons and establish their legacy as the largest cattle ranch in the U.S. With its impressive cast, 1923 may even surpass Yellowstone as the flagship show of Taylor Sheridan's Neo-Western universe.