It's Always Sunny in Philadelphia: Season 18
Season 18 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of It's Always Sunny in Philadelphia Season 17.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
Episode Guide
Season 18 Progress Shield
Frank Marries a Corpse
Aug 17, 2026 · 23 min
The guys help Frank with his cold feet ahead of his wedding to Sam. Dee tries to scare Sam off the nuptials with testimonies from The Waitress, Artemis, and Snail.
Dennis and Dee Don't Get Rich
Aug 17, 2026 · 23 min
The Reynolds twins push themselves to the limit to secure Sam's transfer of wealth. Charlie and Frank plan a proper memorial for Bonnie during the annual Mummers Parade.
The Gang Gets Tested
Aug 24, 2026 · 24 min
Dennis and Dee are diagnosed with ADHD, and even more shocking: Mac isn't. They go back to school for a do-over now that they understand their brains more better.
2026: A Virtual Insanity
Aug 31, 2026 · 21 min
The Gang's RV breaks down en route to a Jamiroquai concert, leaving them to fend for themselves in a dangerous wasteland of junkies and street people.
The Gang Goes to the Ren Faire
Sep 7, 2026 · 23 min
Mac, Dennis, and Dee strive to conquest their way onto the Quilt of Legends at the local Renaissance Faire. Charlie discovers a love of luting while Frank tries to acquire the fair
The War on Alcohol
Sep 14, 2026 · 24 min
The Gang takes the trend against drinking into their own hands. Dennis, Dee, and Frank look to recruit white collar suits for happy hour while Mac and Charlie seek to enlist blue c
Gilligan's Island: A Conspiracy Theorist's Paradise
Sep 21, 2026
Mac and Charlie drink the proverbial Kool-Aid while trying to uncover the mystery of why 'Gilligan's Island' never made it to 100 episodes.
Mac and Dennis Tear Their ACLs
Sep 28, 2026
After a Christmas card catastrophe, Charlie nurses a bedridden Mac and Dennis and deliberates on which one is the originator of all their ideas. Dee and Frank are tired of being th
Frank's Team: A Dark Day for Baseball
Oct 5, 2026
In an effort to clean up their image, Paddy's sponsors a local Little League team. But when The Gang spots softness in their franchise, they impose a radical new culture: win no ma
The Guys Have a Sleepover
Oct 12, 2026
Blinded from LASIK surgery, Dee pleads for the guys to spend the night to keep her safe from neighborhood crime, but they listen to the wolves inside themselves and opt for a dudes