The Yellowstone story isn’t over — it’s transforming. Taylor Sheridan’s expanding universe continues with Y: Marshals, a gritty new spin-off following Casey Dutton (Luke Grimes) as he leaves ranch life behind to face a new kind of frontier: federal law enforcement.

The newly released trailer, paired with a leaked teaser, gives fans a haunting first look at Casey’s transformation from cowboy to U.S. Marshal.

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A New Beginning for Casey Dutton

Casey’s voice opens the trailer with a single line that defines the series: “I’m changing paths — trying to find a new beginning.”

No longer tethered to the Yellowstone Ranch, Casey joins an elite team of Marshals tracking fugitives across the rugged Montana landscape. But this is not a story of simple justice. It’s one of grief, redemption, and reckoning.

According to CBS, Y: Marshals blends Casey’s Navy SEAL precision with his ranch-bred grit, creating a character torn between two worlds — duty and despair. Every mission forces him to confront not just criminals but the ghosts of his past.

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Behind the Scenes and Premiere Details

Y: Marshals premieres spring 2026, airing Sundays at 9/8c on CBS for a 13-episode season.

The series pairs SEAL Team showrunner Spencer Hudnut with Yellowstone creator Taylor Sheridan, promising an emotionally grounded yet action-driven narrative. Sheridan remains hands-on as executive producer alongside David C. Glasser, Luke Grimes, John and Art Linson, Ron Burkle, David Hutkin, and Bob Yari.

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Cast and Returning Faces

• Luke Grimes as Casey Dutton

• Breckin Merrill as Tate Dutton

• Gil Birmingham as Thomas Rainwater

• Mo Brings Plenty as Mo

• Logan Marshall-Green as Pete Calvin

• Arielle Kebbel, Ash Santos, Tatanka Means, and Brett Cullen join as new Marshals

One name is notably absent — Kelsey Asbille’s Monica. Her omission from all promotional materials has fueled speculation. In the trailer, Casey still wears his wedding ring, sparking theories that Monica’s fate may drive the emotional core of the series.

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Inside the Leaked Teaser (Spoilers Ahead)

Production leaks hint that Episode 1 will open with devastating flashbacks revealing Monica’s death — possibly in childbirth — and Casey’s desperate attempt to hold his life together. Grief pushes him toward therapy, an unexpected but powerful storytelling choice in Sheridan’s world.

Amid this turmoil, his former Navy comrade Pete Calvin re-enters his life, offering a lifeline: a chance to join the U.S. Marshals. The decision becomes Casey’s turning point, transforming pain into purpose.

The emotional weight extends to his relationship with Tate, who fears losing the only parent he has left. Their fractured bond becomes one of the season’s most compelling threads.

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Tone, Style, and Sheridan’s Vision

Expect Y: Marshals to carry the cinematic realism of Special Ops: Lioness with the emotional gravity of Yellowstone. Every gunfight, every mission, and every quiet conversation will be steeped in Sheridan’s signature tension — where justice is never clean, and healing always costs something.

Luke Grimes teased, “In Yellowstone, Casey was lost. Now he finally has a purpose.”

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A Frontier Reborn

With whispers of possible cameos from Beth, Rip, or John Dutton in flashbacks, Y: Marshals promises to connect Sheridan’s growing frontier universe in surprising ways. But make no mistake — this is Casey’s story now.

If the leaked footage is any indication, Y: Marshals will be more than a spin-off. It’s a reinvention — a Western-infused redemption tale about a man trying to find peace in a world that refuses to give it.

The countdown to spring 2026 is on. Saddle up, because Casey Dutton’s next chapter is about to redefine justice on the modern frontier.