Horizon will be a two-part Western film starring Kevin Costner.
The movies will release in theaters one year apart in 2024.
Costner plays a widowed Civil War veteran who leads a wagon train across the American West.
Horizon will showcase the expansion and settlement of the American frontier.
Director Jon Cassar says the story spans 15 years and has an "epic" scope.
Fans have eagerly awaited Costner's return to the Western genre since Dances with Wolves.
Horizon reunites Costner with Yellowstone co-creator Taylor Sheridan.
The cast includes Sienna Miller, Sam Worthington, and Jamie Campbell Bower.