The thirteenth season of It's Always Sunny in Philadelphia has been officially commissioned by the FXX network and premiered in September 2018 FXX. The first episode aired on September 5th, 2018. It consisted of 10 episodes.
News
On April 1, 2016 it was announced that FXX commissioned season 13 and season 14 of Sunny, tying it for the longest-running live action television comedy in American television history.[2]
In an interview published on March 8, 2017, Glenn Howerton stated that there may be an "extended hiatus" before season 13, and that he may not return to the show: "We may be taking an extended hiatus between season 12 and season 13. So I’m certainly staying open to the possibility of doing more, but there is a possibility that I will not."[3]
In an interview with TV Guide, Kaitlin Olson confirmed that the show will take an extended hiatus to accomodate the cast's other projects: "We ended up pushing our next season a year because we were all busy with separate projects this year. So at the end of this coming shooting season of The Mick I'll step right into Sunny after that."[4]
On April 7, 2018, Kailtin Olson posted the following to her Instagram account, next to a picture of a bird with Sweet Dee's head:
kaitlinolson
Two more weeks until we start shooting season 13 of this lady and a few other guys. #ItsAlwaysSunnyInPhiladelphia #FXX #season13
She also confirmed in an interview with The Wrap that Glenn Howerton will be back for at least a few episodes as Dennis: “I do know that Glenn Howerton is coming back for some episodes...I don’t know the specifics, but I do know how he’s being introduced back in, and it is absolutely hilarious.”[5]
Directed by: Todd Biermann - Written by: David Hornsby
Cindy, the new female member of the gang, successfully pulls off scams; everything works until Mac introduces a lifelike sex doll that looks exactly like Dennis.
Directed by: Lauren Palmigiano - Written by: Megan Ganz
To boost productivity, Dee hires an at-home "Escape Room Experience" service to come to Dennis and Mac's apartment. Will they escape? Who will get the credit? What could go wrong?
Directed by: Kat Coiro - Written by: Dannah Phirman & Danielle Schneider
To one-up the guys, Dee has organized an "all-female reboot" of the Wade Boggs challenge on a first-of-it's-kind, all-female flight headed to L.A. for the women's march.
Directed by: Todd Biermann - Written by: Conor Galvin
Dee gets in with a group of cool, rich housewives. Dennis hits it off with some everyday blue-collar bros. Frank struggles to renew his license, and Charlie and Mac deal with a new generation of bicycle bullies.
Jimmy Buffett is in town and the positive vibes are alive at the bar. But when Mac comes out of the women's bathroom, no one can leave until the bathroom situation is solved.
With nothing to do while their phones update to the latest software, the gang decides to reminisce on old times. As everyone misremembers events from their past, the gang's current reality becomes altered.
Directed by: Kat Coiro - Written by: Adam Weinstock & Andy Jones
It's the weekend of Super Bowl LII, this time from Charlie's perspective. While Charlie searches the back office, Cricket steals the suit leaving Charlie home alone to defend himself.
It's the most important weekend of their lives and Frank has treated the gang and a crew of their ragtag hangers-on with tickets to see the Eagles in the Super Bowl!
Directed by: Todd Biermann - Written by: Rob McElhenney & Charlie Day
Frank tries to recruit Mac for the gang's float for the Gay Pride Parade; Frank comes to the realization that Mac will never be secure with his sexual identity unless he comes out to his father.