It's Always Sunny In Philadelphia Season 18 Debuts To Rare Rotten Tomatoes Score

Published Aug 17, 2026, 9:49 AM EDT Rianna is the Movie News Editor for ScreenRant. After earning her BA in Film Studies, she began her career as an entertainment writer, contributing to several publications before joining ScreenRant. Her dissertation on the impact of streaming on traditional cinema sharpened her focus on the ever-evolving world of film and media. With 10 years in the industry, Rianna continues to cover the stories she loves while also advocating for awareness and representation of rare disabilities, such as Moebius Syndrome, which she lives with. It's Always Sunny in Philadelphia season 18 is defying expectations. The American sitcom, It's Always Sunny in Philadelphia, premiered in 2005 on FX and was created by Rob McElhenney, Glenn Howerton, and Charlie Day. It began as a zero-budget pilot requiring only $200 and is now one of the longest-running live-action American sitcoms in television history. "The Gang" consists of McElhenney, Howerton, and Day alongside Kaitlin Olson and Danny DeVito as their antics wreak havoc on everyone around them. The beloved comedy series It's Always Sunny in Philadelphia has returned for season 18 and is already proving to be worth the wait. Critics have rated the 10th season an impressive 100% on Rotten Tomatoes. This certainly isn't the first perfect rating for the series; there have been others with perfect or near-perfect scores. It's Always Sunny in Philadelphia Rotten Tomatoes Score Season 1 76% Season 2 96% Season 3 90% Season 4 100% Season 5 94% Season 6 94% Season 7 100% Season 8 100% Season 9 100% Season 10 100% Season 11 100% Season 12 90% Season 13 94% Season 14 83% Season 15 100% Season 16 100% Season 17 84% Season 18 100% Reviews for It's Always Sunny in Philadelphia season 18 state that "This series could go on forever and if Mac, Day, Howerton, Olson, and DeVito are able to have fun with it, we will continue to enjoy it from our side. This eighteenth season feels as fresh as the first and I hope this show never goes off the air." ScreenRant's Grant Hermanns added that, "Though it ultimately may not sing quite as well as its immediate predecessors, It's Always Sunny in Philadelphia season 18 certainly still stands above many comedies on the air to date." The trailer for the newest season had some shocking moments, including showing the death of Carol Kane's character Sam, who is a wealthy poultry heiress and the fiancée of Frank Reynolds (played by DeVito). This was a 40-year reunion for both Kane and DeVito, but from the trailer, clearly some hijinx had ensued, leading to a "Weekend at Bernie's"- style wedding. There are more guest stars expected to return, including the McPoyle family reuniting with The Gang. Guillermo del Toro, Jimmi Simpson, Nate Mooney, David Hornsby, and Sandy Martin are all returning to cause even more mayhem for Frank, Dennis, Dee, Charlie, and Mac. At the time of writing, FX had yet to confirm if It's Always Sunny in Philadelphia will return for season 19, but it's clear that fans will always come back to the sitcom as they have shown no signs of slowing down. It's Always Sunny in Philadelphia season 18 will arrive with two episodes on August 17. Release Date August 4, 2005 Network FX, FXX Showrunner Rob Mac Cast Charlie Day Charlie Kelly Glenn Howerton Dennis Reynolds Four misguided friends managing a neighborhood Irish bar in Philadelphia juggling adulthood, relationships, and work-life shenanigans. Reckless selfish behavior, consistently flawed judgment, and the addition of divorced sleazebag Frank Reynolds have led the Paddy's Pub gang through bizarre and uncomfortable misadventures for over two decades. It's Always Sunny in Philadelphia