The upcoming “ Yellowstone ” spinoff at CBS is rounding out its main cast.

“ Y: Marshals ,” which will see Luke Grimes reprise the role of Kayce Dutton, has added seven new cast members. Those include fellow “Yellowstone” alums Gil Birmingham, Mo Brings Plenty, and Brecken Merrill. The three will reprise their roles as Thomas Rainwater, Mo, and Tate Dutton respectively.

The official logline states:

“With the Yellowstone Ranch behind him, Kayce Dutton (Grimes) joins an elite unit of U.S. Marshals, combining his skills as a cowboy and Navy SEAL to bring range justice to Montana, where he and his teammates must balance family, duty and the high psychological cost that comes with serving as the last line of defense in the region’s war on violence.”

The new series regulars include: Ar

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