The newest Boston Blue casting announcement is sweet information.
Star Donnie Wahlberg lately took to Instagram to share that Blue Bloods’ Erin Reagan would make a visitor look within the spinoff’s premiere episode.
That solutions one query: Will Boston Blue be greater than tangentially associated to Blue Bloods?

Why I’m Not Fully Shocked by This Boston Blue Casting Announcement
Boston Blue could also be a by-product, but it surely’s additionally a brand new present in growth, and people typically change as they get nearer to manufacturing.
It was solely a yr in the past that Georgie & Mandy’s First Marriage was set to premiere, with plans to incorporate just one member of the Younger Sheldon forged, which rapidly modified. I figured Boston Blue would do one thing comparable.
In fact, the choice to recast Sean ignited greater than sufficient doubt and confusion.
That always works higher in cleaning soap operas than established exhibits, and a few followers had been vowing by no means to look at Boston Blue due to it.

Nonetheless, the announcement that Erin will visitor star within the first episode follows the identical sample because the casting information from Georgie & Mandy’s First Marriage, and I received’t be shocked if different Blue Bloods characters present up every now and then.
Tom Selleck has already expressed curiosity, and it might make sense for Frank to have a working relationship with the top of the Boston PD.
If Frank had been to intervene in Danny’s profession change, it might make for an fascinating parallel with the premise that Danny moved to Boston to regulate Sean.
Erin’s Inclusion Suggests a Correct, Reagan-Centered Goodbye for Danny

If Erin is within the premiere episode, it means one in every of two issues.
Both Danny will say goodbye to his household in New York earlier than the episode begins, or Erin will go to him in Boston.
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It’s extra more likely to be the latter as a result of in any other case the complete Reagan household would seem within the premiere, and proper now it’s simply Erin.
I’d love a correct pilot, although, with one final take a look at the Reagans earlier than Danny goes off into his personal present.

That’s what would have occurred if CBS had deliberate a by-product earlier than Blue Bloods ended as an alternative of after the very fact, and it’s the very least that the long-lasting collection deserves.
Why Erin, Although? (And Will She Be a Common?)
Though Erin was a beloved member of the Reagan household, she was typically forged in a semi-antagonist position.
Because the district legal professional, she needed to comply with guidelines that always meant arrestees had been launched pre-trial, expenses had been dropped or bargained down, or proof was deemed inadmissible.
That makes her an odd selection for the character who serves as a bridge between Blue Bloods and Boston Blue.
Moreover, followers are longing for details about Jamie and Eddie’s child, who was attributable to be born on June 13, 2025, in response to the Blue Bloods collection finale.

Erin’s inclusion will in all probability showcase her sisterly aspect extra.
She and Danny had been typically at odds on Blue Bloods for skilled causes, so it’ll be nice — and protect that all-important household feeling — for Erin to assist Danny settle in.
Since Sean is changing into a cop in Boston, Erin may also be there to help his profession. It might even be nice if Nicky had moved to Boston, too, in order that Erin has an extra purpose to go to.
Sadly, Erin won’t be an everyday — her present billing is as a visitor star.
Storywise, this is sensible.

Erin is an assistant district legal professional in Manhattan, and the premise would flip right into a parody of itself if there have been a mass exodus of Reagans to Boston, all with parallel jobs to those they held in New York.
That stated, Boston Blue can be smart to make Erin, or different Reagans, recurring components of the forged fairly than writing them out altogether besides for infrequent cameos.
Whereas Erin’s inclusion within the pilot is nice information, there’s a threat that a few of Blue Bloods’ most loyal followers will see her look as a gimmick designed to get them to look at a collection that isn’t the one they lengthy for.
We’ll allow you to be the decide on that.

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Boston Blue will premiere on CBS on October 17, 2025, at 10/9c. Within the meantime, all 14 seasons of Blue Bloods can be found to stream on Paramount+.
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