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Coming up in Primetime Television.

Soaps.com has an improv comedy special for the week of September 9, as well as teasers, a CBS casting switcheroo, a big HBO cancellation, a new DVD box-set and more in our latest Primetime Dish column…

Arrow:
On Wednesday September 11 at 8:00 PM the CW will air a repeat of its May 1, 2013 episode titled “The Undertaking.”

Baby Daddy:
Lucy Hale, who plays “Pretty Little Liars'” Aria Montgomery, will appear in a guest starring role when the ABC Family series returns with season three in 2014. Hale will shoot her scenes sometime in November. However, character details are unavailable at this time.

Boardwalk Empire:
In HBO’s Sunday September 8 9:00 PM season four premiere episode titled “New York Sour” Nucky attempts to make peace with Joe back in 1924. Gillian fights for custody of her grandchild. A Federal Agent gets up to speed with the goings-on in Atlantic City, and the Capones make their presence known.

Breaking Bad:
In AMC’s Sunday September 8 9:00 PM episode titled “To’hajiilee” unexpected things come Walt’s way, as he plans to get to Jesse first.

Brooklyn Nine-Nine:
Interview! Soaps.com sat in on a conference call with Andy Samberg, who will be playing Jake Peralta in the new FOX series that premieres on Tuesday September 17 at 8:30 PM. When asked about the differences of playing on the cop comedy verses on “Saturday Night Live” Samberg stated, “It’s better in that, for me any way, it’s much less stressful because the hardest part of ‘SNL’, for me, was having to create something new every week. And with this I have, basically just scripts handed to me every week that are already great and a bunch of jokes that are already written, which is the hardest part of comedy, in my opinion. So in that regard it’s been a lot less stressful for me.”

Colin & Brad: Two Man Group:
On Tuesday September 10 at 8:00 PM the CW will air the one-hour special starring “Whose Line Is it Anyway’s” Colin Mochrie and Brad Sherwood. Viewers will be able to watch the improv comedy, which is normally sold out nationwide, from the comfort of their own homes.

CSI:
Bethany Joy Lenz (“Dexter,” “One Tree Hill”) will guest star as a mother of two in the 300th episode of the CBS series on Wednesday October 23. “90210” alum Jason Priestley (ex-Brandon Walsh) will also turn up in the milestone episode as a casino tycoon. The new season begins on Wednesday September 25 at 10:00 PM.

Dexter:
In Showtime’s Sunday September 8 9:00 PM episode titled “Goodbye Miami” Dexter and Dr. Vogel attempt to get the Brain Surgeon ‘on the table’, and Dexter watches as someone important to him is murdered.

Game Of Thrones:
Newcomer Hafthor Julius Bjornsson will take over the role of Gregor ‘The Mountain’ Clegane, previously played by Conan Stevens (“Spartacus: War Of The Damned”) and Ian Whyte (“Hercules: The Thracian Wars”). Season four of the HBO series returns sometime in 2014.

Glee:
Read our spoilers for details into how Finn Hudson will be written out of Glee, and who will return for the tribute, during the third episode of season five, which airs on Thursday September 26 at 9:00 PM.

Grey’s Anatomy:
Read our Grey’s Anatomy Spoilers to find out which four actors have been promoted to series regulars and tune in for season ten beginning on Thursday September 26 at 9:00 PM.

Hart Of Dixie:
On Monday September 9 at 8:00 PM the CW will air a repeat of its April 23, 2013 episode titled “If Tomorrow Never Comes.”

Haven:
Season four of the Syfy series returns on Friday September 13 at 10:00 PM with the episode titled “Fallout.” Watch a preview of what’s to come below.

How I Met Your Mother:
Casting change-up! Back in July it was reported that Ellie Kemper (“The Office”) would guest star on the CBS series. TVLine has learned exclusively that Kemper’s guest starring role as Cassie will now be played by “True Blood” actress Anna Camp. Tune in on Monday September 23 at 8:00 PM for the show’s return and Camp’s first appearance.

Mistresses:
Season finale! In ABC’s Monday September 9 9:00 PM season finale titled “I Choose You” something unexpected happens during Savi’s birthday road trip. April makes a decision regarding Richard and Paul, and Elizabeth and Karen go head-to-head.

Nashville:
Will Chase (“Smash”) has been cast as a country music singer named Luke. Season two of the ABC series returns at 10:00 PM on Wednesday September 25.

Once Upon A Time:
Gil McKinney (“Perception,” “Friday Night Lights”) will appear in a multi-episode arc during season three in the role of Prince Eric. Look for him in the sixth episode titled “Aerial.” The new season kicks off on ABC at 8:00 PM on Sunday September 29.