Kevin Costner's latest project, 'Horizon: An American Saga,' is a four-part Western film series about the settlement of the American West, a passion project he has nurtured since the late 1980s. Despite facing skepticism and financing the project himself, Costner wrote, directed, and stars in the series, which explores the brutal realities and cultural clashes of westward expansion. The first chapter, which has received mixed reviews, features a sprawling narrative with numerous characters and storylines set in the 1850s and 1860s. Costner sees 'Horizon' as a deeply personal endeavor, intertwining historical authenticity and emotional storytelling. The series includes appearances by his son Hayes Costner and notable actors like Sienna Miller and Sam Worthington. Costner hopes that the ambitious project, despite its challenges, will resonate with audiences and keep the Western genre alive.