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Horizon: An American Saga – Chapter 3 is an upcoming American epic Western film directed and produced by as well as starring Kevin Costner from a screenplay he co-wrote with Jon Baird, based on an original story he co-authored with Baird and Mark Kasdan. It is the third installment in the titular film series and direct sequel to Horizon: An American Saga – Chapter 2. Costner reprises his role alongside most of the other cast from the previous film consisting of Sienna Miller, Sam Worthington, Giovanni Ribisi, Ella Hunt, Will Patton, Luke Wilson, Isabelle Fuhrman, Thomas Haden Church, Glynn Turman, and Kathleen Quinlan.