Charlie goes into overdrive when he's notified that the health inspector will be arriving that day. Meanwhile, the rest of the gang is trying to exploit a flaw in the air-miles reward system.

The gang tries to expand their horizons by going on a road trip to the Grand Canyon.

After a physical reveals Dennis has high blood pressure, he decides to take a day away from The Gang to de-stress at the beach. But life has other plans, and his day spirals into a string of mishaps until he can no longer contain his rage.

Charlie cheers on Frank at a local chess tournament against a Russian grandmaster. Dennis helps Mac and Dee find boyfriends after getting irritated by Mac’s current boyfriend, Johnny.

Frank runs into an old adversary at the gym when he begins teaching Dee to box after she was robbed. Hoping to make some extra money on the side, Mac and Dennis make preparations for Charlie to compete in an underground street fighting match.

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

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.

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.

Dennis reveals his foolproof system for seducing any woman to the rest of the gang, but they don't grasp the concept.

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

Barbara hooks up with Mac to make Frank jealous, which leads to retaliation from Dennis.

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

Traffic problems as a result of the President's visit to Philadelphia makes it difficult for the gang to see the summer's biggest film, "Thunder Gun Express".

The gang takes a trip to a local waterpark. Dennis takes on a protégé. Frank and Charlie are determined to ride every ride. Mac and Dee get stuck in a tube slide.

When the gang learns that they are in danger of losing their bar due to a zoning mishap, they resort to some outlandish and extreme methods to prevent that from happening. Meanwhile, Frank isn’t too happy when his wife returns to town.

Mac, Dennis and Dee try out for the Philadelphia Eagles. Also interested in becoming an Eagle is Liam and Ryan McPoyle's brother, Doyle.

In the season finale, Charlie accidentally puts Paddy's up as a prize for a dance marathon, which prompts the gang to enter the competition in order to save their bar.

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

The gang gets a real scare after Dee reveals she's pregnant, forcing the guys to recall their last hazy Halloween party to determine who the father is.

Motivated by the drama teacher who inspired her, Dee takes a job as a substitute teacher, and exposes her students to the culture of Paddy's with a field trip to see the Gang's take on the Lethal Weapon series: Lethal Weapon 5.

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.

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 guys crash Dee's bowling league night and compete in a Battle of the Sexes at a bowling alley owned by the McPoyles. Dee, The Waitress, Artemis, and Gail the Snail versus Dennis, Mac, Charlie, and Frank in a classic match to prove who is better.

After quitting their job due to Frank's continuing interference, Dennis and Dee decide to seek alternative income by going on welfare. Meanwhile, Mac and Charlie must now bear the consequences of their friends’ departures from the business.

The McPoyles hold the entire gang hostage at Paddys while Frank is busy searching for his will in the air ducts.