In season 2, they are joined by Frank Reynolds (Danny DeVito), an eccentric millionaire and the neglectful father of the Reynolds twins, who takes over most of the ownership of the bar. The Gang originally consists of janitor Charlie Kelly (Charlie Day), bouncer Mac (Rob McElhenney), and bartender Dennis Reynolds (Glenn Howerton), the three of whom also own Paddy's Pub, in addition to Dennis' twin sister Dee Reynolds (Kaitlin Olson), a struggling actress who works as a waitress there. The series follows a group of misfit, narcissistic sociopaths, referred to as 'The Gang', who run a meager, unsuccessful Irish bar called Paddy's Pub in the neighborhood of South Philadelphia. The show has received critical acclaim, with many lauding the cast performances and dark humor. In December 2020, the series was renewed for a total of four additional seasons, bringing it to 18 seasons. This resulted in it having more seasons than any other American live-action comedy series, replacing The Adventures of Ozzie and Harriet, which ran for 14 seasons (435 episodes) between 19.

The 14th season concluded in November 2019, and was renewed for a 15th season in May 2020, which premiered on December 1, 2021. The series follows the exploits of 'The Gang', a group of narcissistic, sociopathic friends who run the Irish dive bar Paddy's Pub in South Philadelphia, Pennsylvania, but spend most of their free time drinking, scheming, arguing amongst themselves, and plotting elaborate cons against others, and at times each other, for personal benefit, financial gain, revenge, or simply out of boredom, while belittling, berating, and manipulating each other in the process at seemingly any opportunity. It stars Charlie Day, Howerton, McElhenney, Kaitlin Olson and Danny DeVito. It's Always Sunny in Philadelphia is an American sitcom created by Rob McElhenney and developed by McElhenney and Glenn Howerton that premiered on Augon FX and later FXX beginning with the ninth season in 2013.

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