A fierce new frontier begins in 2026 as Kayce Dutton leads a team of U.S. Marshals—and a Hollywood icon joins the cast

Luke Grimes Saddles Up Again as Kayce Dutton

The Dutton legacy lives on. Luke Grimes is officially back as Kayce Dutton in Y: Marshals, the newest Yellowstone spinoff from creator Taylor Sheridan. The full-length trailer dropped this week—and fans are buzzing with excitement and questions.

The new series, debuting March 1, 2026, follows Kayce as he joins an elite U.S. Marshals unit in Montana. But this isn’t just any law enforcement drama. According to the show’s logline, the team faces everything from cartel standoffs and gang violence to… grizzly bears. Yes, really.

Familiar Faces—and a Few Missing

The teaser trailer reveals the return of several key Yellowstone alumni:

• Gil Birmingham as Chief Thomas Rainwater

• Mo Brings Plenty as Mo

• Brecken Merrill, now 17, reprises his role as Kayce’s son Tate

But noticeably absent is Kelsey Asbille as Monica Dutton, Kayce’s wife. Her involvement hasn’t been confirmed, sparking rumors about a deeper marital rift—or possibly a backseat role.

Rainwater tells Kayce in the trailer:
“All Duttons are born killers. But you… you’re a protector.”
It’s a powerful hint at Kayce’s internal conflict—and possibly his future with Monica.

A‑List Actress Joins Cast—Married to Hollywood Royalty

Though not revealed in the trailer, Deadline confirms the series has landed a major A‑list actress, who also happens to be married to a Hollywood legend. Her character, still under wraps, is said to play a powerful figure inside the Montana U.S. Marshals office—and her presence is expected to ignite dramatic new conflicts for Kayce and the team.

The addition of an established movie star marks a major shift in Sheridan’s Yellowstone universe, which has already embraced elite casting across shows like 1923 (Harrison Ford, Helen Mirren) and Lawmen: Bass Reeves (David Oyelowo, Donald Sutherland).

New Recruits & Rivals

Other confirmed cast members include:

• Ash Santos (American Horror Story) as Andrea

• Tatanka Means (Killers of the Flower Moon) as Miles

• Arielle Kebbel (The Vampire Diaries) as Belle

• Logan Marshall-Green as Pete Calvin, Kayce’s former military buddy

• Brett Cullen as U.S. Marshal Chief Harry Gifford

Together, they form Kayce’s inner circle—though it remains to be seen who he can actually trust.

After Costner: A New Era Begins

The spinoff follows a wave of changes in the Yellowstone franchise. Kevin Costner’s abrupt departure in Season 5—reportedly tied to his film Horizon—forced the writers to kill off John Dutton in a murder-for-hire plot.

Luke Grimes has since spoken candidly about Costner’s absence, telling Men’s Health that it made filming “easier,” while also clarifying there’s no bad blood between them.

“I do have his number,” he admitted, “but it’s not really my place to reach out.”

The Stakes Are High—and So Is the Buzz

With Y: Marshals, Sheridan blends Western grit with tactical law enforcement thrills—placing Kayce Dutton at the center of a brutal new frontier. Will this spinoff bring peace to the Dutton legacy—or set the stage for even more chaos?