It’s Always Sunny in Philadelphia Season 18: Release details, cast updates and plot details – Everything we know so far

Saptam Modak — Tue, 26 May 2026 15:54:32 +0000

The depraved, scheme-plotting sociopaths of Paddy’s Pub are officially moving one massive step closer to breaking their own historic television record. Following a highly successful seventeenth season, FXX’s It’s Always Sunny in Philadelphia is locked and loaded to return for a milestone eighteenth season as the longest-running live-action sitcom in American television history.

It’s Always Sunny in Philadelphia Season 18 Release Details

The long-awaited return of The Gang is moving through the post-production pipeline. After the writers’ room originally kicked off in October 2025, principal photography officially began rolling on the Fox lot in Los Angeles in early February 2026.

The most exciting news for fans came on April 17, 2026, when series creator and star Rob McElhenney took to Instagram to post a full cast-and-crew photo, captioning it: “That’s a production wrap on Season 18. Love this crew so goddamn much. Can’t wait to show you what we cooked up.”

Because It’s Always Sunny features a highly efficient, grounded production model that doesn’t rely heavily on extensive digital visual effects, the path from wrap to air is incredibly swift. While FXX has not yet pinned down the exact calendar date on its broadcasting grid, industry tracking heavily indicates that Season 18 will premiere in Summer 2026.

Furthermore, Charlie Day officially confirmed that after three consecutive seasons of truncated, eight-episode blocks, Season 18 is upgrading back to a fuller slate of 10 brand-new episodes.

It’s Always Sunny in Philadelphia Season 18 Cast Updates

The core five elements of Paddy’s Pub’s toxic ecosystem are fully intact for the milestone run:

Rob McElhenney as Ronald “Mac” McDonald
Charlie Day as Charlie Kelly
Glenn Howerton as Dennis Reynolds
Kaitlin Olson as Deandra “Dee” Reynolds
Danny DeVito as Frank Reynolds

DeVito’s return was a major relief for production, as scheduling was carefully woven to accommodate his wrap on the high-profile feature film Jumanji: The Next Level.

Beyond the core quintet, fans can brace for a widespread reunion of the show’s most unhinged recurring guest stars. Direct social media updates from the set have confirmed the returns of:

David Hornsby as the tragically mangled Matthew “Rickety Cricket” Mara.
Jimmi Simpson and Nate Mooney are back to bring the milk-drinking madness as Liam and Ryan McPoyle.
Guillermo del Toro, the Oscar-winning filmmaker, is officially making a highly anticipated return to the screen to reprise his fan-favorite, eccentric role as Pappy McPoyle.
Mary Elizabeth Ellis (The Waitress), Sandy Martin (Mrs. Mac), and Gregory Scott Cummins (Donald McDonald) are also heavily tied to the new episode slates.

Bittersweet Note: Behind the scenes, the cast and crew have dedicated part of their efforts to the memory of veteran actress Lynne Marie Stewart (Charlie’s mother, Bonnie Kelly), who sadly passed away in 2025.

It’s Always Sunny in Philadelphia Season 18 Plot Details

The narrative trajectory for the eighteenth chapter will build off the sharp, topical satirical energy of Season 17, utilizing the current cultural and technological landscape as a playground for The Gang’s immediate downfalls. Charlie Day recently teased that the writing room heavily targeted the modern absurdities of today’s world, including a dedicated dive into the chaos of Artificial Intelligence (A.I.).

Thanks to behind-the-scenes leaks, social media teases, and a heavily redacted script shared by McElhenney for April Fools’ Day, several specific episode plots have already been confirmed:

The Renaissance Faire: In what promises to be an instant classic, The Gang will head to a local Renaissance Faire. On-set photos have revealed the McPoyle family (including Guillermo del Toro’s Pappy McPoyle) fully decked out in medieval garb, alongside Danny DeVito and del Toro reportedly getting into a heated mobility scooter race on the fairgrounds.
“Dennis and Dee Don’t Get Rich”: Confirmed as the official title for Episode 2 (written by Charlie Day and Glenn Howerton), this script block will follow the twins as a massive, short-sighted financial scheme completely blows up in their faces.
Little League Mischief: The Gang will attempt to insert themselves into youth sports, with an episode tracking them as they somehow buy or completely mismanage a children’s Little League baseball team.
The War on Alcohol: Behind-the-scenes footage captured on location showcased the guys outside Paddy’s Pub aggressively pouring out non-alcoholic beer, setting up a storyline where the bar squares off against a new wave of sober-curious or mocktail trends.
Mac and Dennis Tear Their ACLs: Filmed early in the production cycle, this physical comedy block will feature Mac and Dennis engaging in a highly competitive, reckless race against each other outside the pub that leaves them physically incapacitated.

It’s Always Sunny in Philadelphia Season 18 | Business Upturn

It’s Always Sunny in Philadelphia Season 18: Release details, cast updates and plot details – Everything we know so far