CBS has officially announced a major casting change for its upcoming ‘Blue Bloods’ spinoff, with actor Mika Amonsen stepping into the role of Sean Reagan — the son of Detective Danny Reagan, played by Donnie Wahlberg.
A New Face for a Familiar Character
In a bold creative move, CBS is recasting the role of Sean Reagan, originally portrayed by Andrew Terraciano throughout the original run of Blue Bloods. With the spinoff aiming to explore new stories and potentially reach a broader audience, the network has tapped rising actor Mika Amonsen to bring a fresh take on the Reagan legacy.
Amonsen’s version of Sean Reagan is expected to be slightly older, more independent, and more involved in the family’s law enforcement tradition, reflecting the show’s time jump and its shift in focus toward a younger generation of Reagans.
Who Is Mika Amonsen?
Mika Amonsen is a relative newcomer to the screen but has already gained attention for his performances in several off-Broadway productions and a supporting role in an acclaimed streaming drama. Known for his emotional range and grounded screen presence, Amonsen is expected to bring a deeper complexity to the role of Sean, who has largely remained in the background in recent Blue Bloods seasons.
Donnie Wahlberg Returns — And Reacts
Donnie Wahlberg will reprise his iconic role as Detective Danny Reagan and is said to be supportive of the casting change. In a recent interview, Wahlberg praised Amonsen’s audition and expressed excitement about exploring the evolving dynamic between Danny and his son:
“It’s going to be a new chapter — for Danny and for the fans. Mika brings something special to the role, and I can’t wait for everyone to see where the Reagan family goes next.”
What to Expect from the Spinoff
The untitled Blue Bloods spinoff will continue to center around family, tradition, and justice — core themes of the original show — but with a renewed focus on the next generation of Reagans. CBS has hinted at a more serialized format, with deeper character arcs and more modern-day policing dilemmas.
The show is currently in pre-production and is expected to premiere in early 2026, pending final casting and script approvals.
📺 Final Thoughts
Recasting a well-known role is always a risk, especially for a show with such a loyal fanbase. But CBS appears confident that Mika Amonsen can carry the legacy of Sean Reagan into a new era. With Donnie Wahlberg onboard and the promise of fresh storylines, the Blue Bloods spinoff is shaping up to be one of CBS’s most anticipated projects in years.
