“Y: Marshals” is the next big Yellowstone spinoff, premiering March 1, 2026 on CBS. The series picks up after Yellowstone and follows Kayce Dutton, played by Luke Grimes, as he trades ranch life for a badge. He joins an elite U.S. Marshals unit where he blends cowboy grit with Navy SEAL training to keep Montana from going full Wild West. The teasers hint at Kayce trying to reinvent himself, confront his past, and deal with emotional baggage that’s heavier than a Dutton family breakfast — in other words, classic Kayce turmoil.