Charlie, Mac, and Dennis formulate a plan to take advantage of the rising gas prices. By purchasing excess amounts now, they can sell it in the future and profit. As usual, things don't go as planned. Dee is also out to make money when she learns that Bruce is going to give the family fortune to a Muslim cultural center. She and Frank try to stop him and get the cash for themselves.

Charlie finds out that the waitress has been seeing someone. He calls on Mac, his so-called best friend, to find out more information about the guy and to beat him up. However, it turns out that Mac is the guy the waitress has supposedly been seeing. Dennis, heartbroken that he's not Charlie's best friend, tries to win him over.

A newspaper critic is kidnapped by the gang after he calls Paddy's pub the worst bar in Philadelphia.

After Dee suffers a heart attack, she and Dennis try to live a healthier lifestyle. Meanwhile, Charlie and Mac take corporate jobs to get health insurance.

Hoping to make their own dreams come true, the gang sets out to give an unexpected family an extreme home makeover.

In the season finale, Charlie gets the gang to help him put together a rock opera based on his song "Nightman."

Dennis, Mac, and Frank go into real estate, while Dee sets out to be a surrogate for a wealthy couple. Charlie gets into it with an attorney over the law.

Frank's behavior is more bizarre than usual---so bizarre that even the gang notice---so they decide to stage an intervention.

The waitress is getting married, Dee is jealous that she's beating her to the altar, so she tries to derail the wedding.

The gang puts together a wrestling show for returning troops. Meanwhile, Dee finally meets the soldier that she has been communicating with over the internet.

After being banned for 10 years from a local drinking competition appropriately named "Flipadelphia," the gang tries to reignite their old rivalry with another local bar. Finding that they are in need of some serious practice, the guys head to Dennis' old fraternity house at the University of Pennsylvania to get their game up to speed while Dee hones her skills on her own. Frank wears skinny pants.

Mac defends traditional marriage, while the rest of the gang reaps the rewards of wedded bliss.

Marital bliss turns into business, as the gang experiences the emotional and economic hardships of divorce.

The gang attempts to find adventure on the sea after they purchase their 'new' boat.

A blast from the past prompts the guys to expand membership, and Dee to re-consider her future.

Keeping the basement rodent-free drives Charlie to the brink. The gang throws Charlie a surprise party.

En route to Atlantic City for a charity event, Mac, Frank and Dee get lost. Meanwhile, Dennis and Charlie hitch a ride to town.

With Frank intent on marrying a prostitute, The Gang tries to make the best of it by attempting an image makeover to uncover the heart of gold that exists deep inside Frank’s “pretty woman.”

Dee and Dennis take the gang to their favorite childhood vacation spot where things aren't quite how they remember. While Dee and Dennis see the seedy side of the Jersey Shore, Mac, Frank and Charlie have the nights of their lives.

Dee faces an IRS audit over her claim that the baby she carried as a surrogate is her dependent, while the guys decide to run the bar in an unemotional, democratic manner rather than their typical method of shouting and personal attacks.

When Frank's long lost brother Gino shows up at the bar, the two of them tell the gang about the jazz club they ran in the 1960s and 70s, and how they fell out over Shadynasty, a singer who was the love of both of their lives.

As a hurricane threatens Philadelphia, Mac, Dennis and Charlie go to a mall to buy supplies and check out the large breasted TV reporter broadcasting from there, while Frank and Dee prepare Paddy's, and its basement bunker, for the storm.

The gang uses the Internet to cyber-stalk their prey. Frank tries to drum up business for Paddy's with a viral video.

Dennis and Dee's ailing grandfather Pop-Pop is wasting away in the hospital, and they have to decide whether or not to pull the plug. But things get complicated when The Gang learns of Pop-Pop's history as a Nazi, and Mac, Charlie and Frank set off in search of the old man's spoils from the war.

Charlie and Dee become romantically involved with two members of a wealthy family, which arouses jealousy in Mac, Dennis and Frank.

Mac, Charlie and Dee struggle with their faith as Charlie's mom fights cancer. Meanwhile, Frank loses his memory amidst a search for buried treasure.

Every member of The Gang has something to celebrate at Guigino's, Philly's finest eatery, but when Mac and Dennis' private dinner is interrupted by an unexpected sighting of Frank and Charlie, the in-fighting begins. Dee also turns up at a table for one, and over the course of the night, the "one-ups-manship" soars to new heights.

Court is in session at Paddy's Pub as Frank and Dennis present their cases to the rest of the gang, resulting in a verdict that will change their lives FOREVER... but not really.

The gang attempts to cheer up a deeply depressed Dee, realizing they are the cause for her predicament.

Tired of failing to be recognized for their years of service in the bar industry, the gang changes their ways to give the patrons what they think they want.

The gang does their best to recoup their investments in questionable schemes by dumping their losses on Ben the soldier while trying to avoid being duped again by whatever mastermind is pulling their strings.

The gang voluntarily quarantine themselves inside of Paddy's in an attempt to keep their singing voices pristine for an upcoming competition when a severe flu outbreak sweeps Philadelphia.

When an experiment successfully multiplies Charlie's intellect and takes him away from the bar, the rest of the gang find themselves struggling to complete the menial "Charlie Work" that has kept the bar running for so long.

Mac oversees the gang while they compete to break Wade Boggs’ legendary beer drinking record.

The gang gets into the online dating scene to expand their matchmaking potential.

When Psycho Pete, long lost member of the freight train, is released from the mental hospital, Dennis and Dee rush to get him recommitted while Charlie and Mac attempt to restore him to his former hard-partying form.

News surfaces about Mac's Dad, Luther, being a murder suspect. Mac goes into full "P.I." mode to clear his father of any wrong doing.

Frank decides to retire; the foursome begin to plot and plan ways for each of them to take control of the bar.

The gang agrees to a truce while demonstrating Chardee MacDennis for an interested board game executive, but the nature of the game quickly sends things off the rails

Mac and Dennis move to the suburbs for cheaper rent but find it hard to adjust.

Dennis tries to create an innovative mobile Paddy's pub experience but runs into trouble when customers refuse to cooperate, while Charlie and Mac attempt to catch a thieving leprechaun.

The gang tries to take a vacation from their usual dynamic by going on a cruise, but old habits die hard.

The gang gets real with one another in the face of death.

Charlie thinks Mac's mom is holding his mom hostage so the gang installs spy cameras in their house. They discover the moms are quite entertaining once Dennis makes edits to the footage.

A cat-woman is killed and Dennis becomes the main suspect.

The gang fight over a lottery ticket and seek out an arbitrator to decide a rightful owner, who also decides if Frank is a hero or hate monger.

It’s Valentine’s Day and Paddy’s is packed with customers. Dennis implores the gang to do one day of actual work but everyone else is distracted by a mystery crate Cricket spotted in the alley. Eventually, the gang becomes convinced Dennis really wants them to work on their relationships and everyone shares their grievances without much resolution.

Dennis reveals he has a baby after his Wade Boggs layover in North Dakota and the gang try to help him get out of the jam, but their suggestions border on the extreme.

Meet Cindy, the new, ethnically diverse female member of the gang who can successfully pull off scams. Everything is working until Mac introduces a new member: a life-like sex doll that looks exactly like Dennis.

Paddy's has been put on a list of bars that are sexually hostile to women, and the gang must attend a sexual harassment seminar to get off the list.

With nothing to do while their phones update to the latest software, the gang decides to reminisce on old times. As everyone misremembers events from their past, the gang's current reality becomes altered.

It's the weekend of Super Bowl LII from Charlie's perspective. While Charlie searches the back office, Cricket steals the suit leaving Charlie home alone to defend himself.

It’s the most important weekend of their lives and Frank has treated the gang and a crew of their ragtag hangers-on with tickets to see the Eagles in the Super Bowl!

The Gang finds themselves in the middle of a focus group after a screening of Thunder Gun 4: Maximum Cool. They are determined to restore glory and traditional American values back into the franchise, even if it involves sabotage.

The Guys are in the final preparation stage for an unknown scheme when Dee excitedly enters to inform them that today is “Dee Day.” The guys have to do everything she wants without complaint.

During their trip to the Philadelphia Zoo, Mac sets up a text group chain for The Gang, but confusion sets in and The Gang must learn from the meerkats on how to communicate properly in a group.

As a record-breaking heat wave overtakes Philly, the Gang plans to profit from global warming by pumping up the A/C so people will congregate at Paddy's and save energy at home.