Marshals' Every good story doesn't have an ending — just ask Luke Grimes. After CBS announced that the actor would return as Kayce Dutton in a brand-new Yellowstone spinoff series that has a working title of Y: Marshals,

CBS revealed its 2025-26 schedule, which also includes "Blue Bloods" spinoff starring Donnie Wahlberg and an "FBI: CIA" series starring Tom Ellis.

In May 2025, Deadline reported that a spinoff series starring Grimes called Y: Marshals is on the way. The series will follow Kayce as he becomes a U.S. Marshal in Montana. The show joins a number of Yellowstone prequels, spinoffs and sequel series, including 1883, 1923, 1944, 6666, Lawman: Bass Reeves and The Madison.