Dylan Walsh's Mayor Offers Erin an Opportunity on 'Blue Bloods' (PHOTOS)

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Friends in High Places
John Paul Filo/CBS
Friends in High Places
John Paul Filo/CBS

Frank (Tom Selleck)

Friends in High Places
John Paul Filo/CBS

Frank and his inner circle: Baker (Abigail Hawk), Gormley (Robert Clohessy), and Garrett (Gregory Jbara)

Friends in High Places
John Paul Filo/CBS

Danny (Donnie Wahlberg), Andrew (guest star Julian Biederman), and Karen (Paton Ashbrook)

Friends in High Places
John Paul Filo/CBS

Henry (Len Cariou) works as an investigative consultant for child services.

Friends in High Places
John Paul Filo/CBS

What’s going on?

Friends in High Places
John Paul Filo/CBS

Danny and Henry with the Davises

Friends in High Places
John Paul Filo/CBS

Can Danny and Henry help this mother and son?

Friends in High Places
John Paul Filo/CBS

Stan Rourke (returning guest star Dan Lauria) and Frank

Friends in High Places
John Paul Filo/CBS

What’s in Stan’s hand?

Friends in High Places
John Paul Filo/CBS

Mayor Peter Chase (Dylan Walsh)

Friends in High Places
John Paul Filo/CBS

Peter and Erin (Bridget Moynahan)

Friends in High Places
John Paul Filo/CBS

Mayor Peter Chase

Friends in High Places
John Paul Filo/CBS

Erin meets the new mayor.

Friends in High Places
John Paul Filo/CBS

The Mayor in his office

Friends in High Places
John Paul Filo/CBS

What’s the offer?

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Is a job change in Erin's (Bridget Moynahan) future on Blue Bloods?

Dylan Walsh's Mayor Peter Chase presents her with a life-changing opportunity in the November 15 episode. As previously revealed when his casting was announced, he wants her to run for the Manhattan District Attorney's office. Will she accept?

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In "Friends in High Places," Henry (Len Cariou) works as an investigative consultant for child services, and he and Danny (Donnie Wahlberg) butt heads over a case involving a man who is volatile toward his wife. Frank (Tom Selleck) is caught in the middle of an ongoing battle between the NYPD and the FDNY. (Dan Lauria returns as Stan Rourke; the fire commissioner and Frank went head-to-head in Season 6.)

Also in this episode, Jamie (Will Estes) is suspicious about an investigation targeting Eddie's (Vanessa Ray) partner, Kenneth Troy (Eric Troy Miller).

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11 Most Memorable 'Blue Bloods' Guest Stars (PHOTOS)

In honor of two returning actors in the 200th episode, we look back at some notable recurring characters.

Click through the gallery above for look at Walsh's debut, Lauria's return, and more.

Blue Bloods, Fridays, 10/9c, CBS