Wikimedia Commons/The Gray House Prime Vide Celebrity Kevin Costner's Civil War spy drama. Four women risk everything for the Union. Premiered on Prime Video to mixed-positive reviews. March 25, 2026 AceShowbiz - The Gray House, an eight-episode Western series produced by Kevin Costner, has premiered on Prime Video to encouraging critical feedback. The show, which debuted on February 26, 2026, has already accumulated enough reviews on Rotten Tomatoes to generate an early consensus, earning a 60% score from critics based on its first five reviews.