Danny Reagan is back on the case in the new "Blue Bloods" spinoff "Boston Blue."

The detective Donnie Wahlberg played for 14 seasons on "Blue Bloods" has relocated from New York City to become a new member of the Boston Police Department.

The new show will also feature an appearance by another "Blue Bloods" alum, Bridget Moynahan , who played Reagan's sister, Erin.

Here's what to know about "Boston Blue."

When Does 'Boston Blue' Premiere?

The first episode is on Oct. 17 at 10 p.m. ET, and new episodes will be released on Fridays.

Where Can You Watch 'Boston Blue'?

Episodes will air at 10 p.m. ET on CBS and will stream on Paramount+.

Who Is in the Cast of 'Boston Blue'?

Maggie Lawson as Sarah Silver, Donnie Wahlberg as Danny Reagan, Sonequa Martin-Green as Lena Silver and Ryan Br

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