The newly released trailer for Y: Marshals, the upcoming Yellowstone spinoff set to premiere on CBS in March 2026, has fans buzzing with excitement as it confirms the return of several major stars from the original series while also highlighting one notable absence that’s already sparking fan theories. Y: Marshals picks up after the events of Yellowstone, focusing on Kayce Dutton (Luke Grimes) as he transitions from life on the ranch to a new role as part of an elite U.S. Marshals unit tasked with providing “range justice” across Montana — a path that combines his cowboy and Navy SEAL training in a fresh and dramatic way. Wikipedia

Among the cast confirmed by the trailer and recent announcements are Luke Grimes as Kayce Dutton, Gil Birmingham as Thomas Rainwater, Mo Brings Plenty as Mo, and Brecken Merrill as Tate Dutton, marking a strong Yellowstone presence in the new series and giving fans familiar faces to anchor the spin‑off’s narrative. Wikipedia These returning characters not only provide continuity with Yellowstone’s emotional legacy but also point toward new dynamics and story directions as Kayce adjusts to law enforcement life, continues to balance family obligations, and confronts the psychological toll that comes with his new job. Wikipedia

In addition to the returning faces, the trailer introduces several new characters played by actors such as Arielle Kebbel, Ash Santos, Tatanka Means, and Logan Marshall‑Green, who round out the marshal team and contribute fresh energy and conflict potential to the series. Wikipedia Their inclusion suggests that Y: Marshals will blend classic Western themes with procedural action, forging a distinct identity while maintaining ties to the broader Yellowstone universe. Wikipedia

Despite the excitement over these returning cast members, one key face conspicuously missing from the trailer — and the main promotional material so far — is Kelsey Asbille’s Monica Dutton, Kayce’s wife and mother of their son Tate. Country Living+1 Monica played a central role in Kayce’s story throughout all five seasons of Yellowstone, providing emotional grounding and moral balance even in the midst of the brutal conflicts surrounding the Dutton family. Country Living Her absence in Y: Marshals has left viewers speculating about her fate and how her story will be addressed — with theories ranging from her being off‑screen due to narrative reasons to more dramatic possibilities such as the character’s death or a significant life change that separates her from Kayce’s marshal journey. Country Living

The missing Monica isn’t the only point of fan discussion; some viewers have also wondered about the potential for flashbacks or archival appearances of other beloved characters, such as John Dutton (originally played by Kevin Costner), given that past conflicts and family relationships remain central to the emotional undertones of the Yellowstone universe. TV Insider However, with John’s storyline concluded in the original series, any return would likely need to be handled via flashback or creative narrative framing, adding another layer of anticipation about how Y: Marshals will connect to its predecessor. TV Insider

The trailer itself gives viewers glimpses of Kayce navigating rugged terrain, training sequences with his marshal team, and tense moments that suggest Y: Marshals will lean into both action and character development. TVLine It sets up an arc that honors Kayce’s past while pushing him into new territory — literally and figuratively — and the return of Rainwater and Mo indicates that community ties and lasting relationships from Yellowstone will continue to influence the emotional stakes. TVLine

Already, fans on social media are dissecting every second of the trailer, debating what Monica’s absence means, whether other Yellowstone figures could make surprise appearances later in the season, and how Kayce’s marshal role will reshape the tone of the franchise. TV Insider Because Monica has been so integral to Kayce’s personal growth and moral compass throughout Yellowstone, her missing presence invites questions about how Kayce will evolve independently and whether Y: Marshals will revisit unresolved interpersonal threads from the original show. Country Living

In summary, the Y: Marshals trailer confirms the return of key Yellowstone stars like Luke Grimes, Gil Birmingham, Mo Brings Plenty, and Brecken Merrill, ensuring that the spin‑off retains emotional and narrative continuity with the franchise’s roots. Wikipedia However, the notable absence of Monica Dutton — a beloved character and cornerstone of Kayce’s life in Yellowstone — stands out as a major missing face, prompting speculation and curiosity about how her storyline will be handled as the new series unfolds. Country Living Fans have plenty to look forward to when Y: Marshals premieres in March 2026, with a mix of familiar relationships, new alliances, and unresolved questions that are sure to keep the Yellowstone universe thriving on the small screen. Wikipedia