Horizon: An American Saga is the latest project of actor, producer, and director Kevin Costner. Costner has been working to bring the film series — which has a planned arc of four installments — to life since 1988.

Chapter 1 of the four-film series was released in theaters June 28. The cast of the first film includes Costner, Luke Wilson, Jamie Campbell Bower, Jena Malone, Sam Worthington, Isabelle Fuhrman, Ella Hunt, Sienna Miller, Tom Payne, Michael Rooker, Tatanka Means and Abbey Lee, Giovanni Ribisi, Glynn Turman, Kathleen Quinlan, Angus MacFayden and more.

Horizon: An American Saga premiered at the 2024 Cannes Film Festival, where Costner sought funding for the final two films. The first film runs just over three hours and sets up the story to continue in Chapter 2.

The films center on the Western expansion in America before and after the Civil War as the idea of Manifest Destiny changes the lives of Native Americans. The story spans 15 years after the end of the Civil War.

Chapter 2 of Horizon was set to launch in theaters on August 16, but given the underperformance of Chapter 1 at the box office, the second film's release has been delayed. The films are produced by Warner Brothers, but Costner has spent almost $100 million to finance the four films. Costner named his first son Hayes after a character in Horizon, Hayes Ellison, whom Costner portrays.