It's Always Sunny in Philadelphia

After noticing rise in underage patrons, the gang decides to make a few accommodating adjustments for their younger crowd. In addition to assuaging their concerns of morality and responsibility, it allows the gang to both turn a profit and relive their high school years with a second chance at popularity. Ultimately, they get caught up in the petty politics and crushes of the high-schoolers.

The gang learns that Charlie might have cancer and hatches a shallow-minded plan to alleviate his anguish. However, there is more to Charlie's diagnosis than meets the eye. Meanwhile, Mac proves himself a narcissist when he gets involved with a tranny to satisfy his vanity.

Upon learning that the bar's safe has been stolen, the guys take matters into their own hands and buy a gun. Shortly thereafter "gun fever" strikes, bringing out the inner-Hardy Boy in Dennis and Mac, who vow to catch the thief, and the inner-tough guy in Charlie, who uses the gun to intimidate his nagging landlord. Meanwhile, gun fever also hits Dee, as she feigns interest in guns to try and seal the deal with Colin, a crush that only seems to have mild interest in her.

Mac and Dennis pretend to be acquainted with a patron found dead in their bar in order to get closer to the dead man’s granddaughter. They reach new moral lows as the competition for her affection brings out the best and worst in Mac and Dennis. Meanwhile, Charlie acts as support for Dee as she visits her bedridden grandfather and finds himself in a precarious situation when the old man enlists Charlie in a plan, leading to a surprising discovery.

The gang learns that Charlie and Mac's high school gym teacher has been accused of molestation and they get worried when Charlie reacts oddly to the news. Dee and Dennis feel empowered to help their friend and go to the lengths of staging an intervention that includes Charlie's terrified family and the other alleged victims, the awkwardly creepy McPoyle brothers. Meanwhile, Mac's grief over the molestation report takes an unusual form as he seeks answers that might potentially restore his ego.

The gang discovers the perks of being handicapped when Charlie becomes wheelchair-bound after getting hit by Dennis' car.  Meanwhile, Dennis and Dee's estranged father, Frank Reynolds, returns to town to reconnect with his kids, who want nothing to do with their father.  Frank has a blast hanging with the gang and decides to settle in South Philly permanently, and becomes Charlie's roomie.

The gang discovers they may lose part of their bar due to a zoning mishap and an overzealous new business neighbor, and use unorthodox measures to remedy the situation.  Meanwhile, Dennis and Dee's mother, Barbara, returns to town and makes Frank's life miserable, and Frank takes steps to cement his roots in South Philly when he becomes part owner of Paddy's.

Realizing they can no longer stand to work with their father, Dennis and Dee quit their jobs at Paddy's and they concoct a plan to get welfare benefits so they can pursue their real, and completely unrealistic, dreams and goals. Mac and Charlie soon experience the downside of Dennis and Dee's absence when Frank starts dumping all the work on them, and, even worse, tries to be a father figure to them.

After being arrested for arson the gang is sentenced to do community service. Frank makes an effort to connect more with Dennis. Meanwhile, Charlie is also ordered to attend AA where he makes a startling discovery that might be beneficial in his ongoing quest to hook up with the Waitress.

After getting mugged, Dee agrees to take boxing lessons from Frank, who's thrilled with the prospect of reliving his glory days as a pro-fighter. Frank encounters his former nemesis at the old gym and gets the chance to rewrite their history. Meanwhile, Mac and Dennis hope to make some cash by entering Charlie in an underground street fight match, and Dee and Charlie dabble with performance enhancing supplements.

Jealous of Frank's newfound happiness reconnecting with his kids and reliving his youth, Barbara gets back at Frank by having sex with Mac. This one act sets in motion a series of back-stabbing and deceptive moves among our gang as they use the threat of sex for their own selfish purposes.