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

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Blue Bloods guest stars
John Paul Filo/CBS; Craig Blankenhorn/CBS (2)
Your Six
John Paul Filo/CBS

Peter Hermann

Hermann recurs as Jack Boyle, Erin’s ex-husband and Nicky’s father.

Confessions
CBS

Stacy Keach

The archbishop has known the Reagans for years and even married Jamie and Eddie.

The Real Deal
John Paul Filo/CBS

Treat Williams

Lenny Ross is Frank’s old partner who usually needs help from the commissioner when he shows up.

Common Enemies
John Paul Filo/CBS

Callie Thorne

Maggie is the medium who helps Danny and Baez with cases.

Blackout
Craig Blankenhorn/CBS

Aasif Mandvi

Erin had to deal with District Attorney Samar Charwell in Season 9.

Bad Blood
Craig Blankenhorn/CBS

Kirk Acevedo

Baez lost her estranged brother during a case.

Risk Management
Craig Blankenhorn/CBS

Bebe Neuwirth

Frank often clashed with Kelly Peterson.

Hard Bargain
Giovanni Rufino/CBS

Kevin Dillon

Danny’s brother-in-law has a habit of getting into trouble with the law.

Partners
John Paul Filo/CBS

David Ramsey

(Former) Mayor Carter Poole often clashed with Frank.

By Hook or by Crook
Craig Blankenhorn/CBS

Lou Diamond Phillips

Danny found common ground with his enemy, Luis Delgado, as the same man was responsible for their wives’ deaths.

pressexpress
Jojo Whilden/CBS

Bobby Cannavale

Charles Rosselini was Erin’s boss in Season 1.

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Blue Bloods celebrates its 200th episode Friday with an episode that brings back two notable guest stars. (One of them even gets the honor of joining the family for Sunday dinner, a first for an outsider.)

And over the nine seasons of the CBS drama so far, there have been numerous key guest stars, from those who have clashed with Frank (Tom Selleck) over the years to the man who married Jamie (Will Estes) and Eddie (Vanessa Ray) offscreen in May's finale.

8 'Blue Bloods' Characters We Hope Return in Season 10 (PHOTOS)See Also

8 'Blue Bloods' Characters We Hope Return in Season 10 (PHOTOS)

We'd like to catch up with these characters when the CBS procedural drama returns in September.

Click through the gallery above for a look back at some of the more memorable guest stars as we celebrate the show's milestone.

Blue Bloods, Season 10 Premiere, Friday, September 27, 10/9c, CBS