Horizon: An American Saga – Chapter 1 is a 2024 American epic Western film directed and produced by Kevin Costner from a screenplay he co-wrote with Jon Baird, based on an original story by the pair and Mark Kasdan. The first installment in the titular film series, it features an ensemble cast of Costner, Sienna Miller, Sam Worthington, and Giovanni Ribisi, with Jena Malone, Abbey Lee, Michael Rooker, Danny Huston, Luke Wilson, Isabelle Fuhrman, Jeff Fahey, Will Patton, Tatanka Means, Owen Crow Shoe, Ella Hunt, and Jamie Campbell Bower in supporting roles. The film follows several characters navigating life in the Midwestern territories amid the American Civil War.