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.

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

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.

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

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.

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

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

Dee gets involved with a famous local rapper who might be mentally challenged, and whose success inspires the rest of the gang to start a band.

After years of being mistreated by Frank during the holiday season, Dennis and Dee decide to teach him a lesson. Meanwhile, Mac and Charlie reflect on their childhood Christmases, and realize that they were not as joyous and wonderful as they remembered.

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.

The gang plays the most twisted board game ever. Dee and Dennis face Mac, Charlie and Frank.

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.

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.

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, 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.

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

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.

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.

When the gang appears on a nationally broadcasted game show, Dennis does his best to keep the gang’s weirdness under wraps.

Upon learning that Frank's making a "Hometown Visit" with his Golden Bachelor partners, the Gang rehearses their family dinner to appeal to America.

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.

After Mac arrives to the bar with scratches on his neck and exhibiting strange behavior, Frank comes to the conclusion that he is the serial killer terrorizing young women in Philadelphia. Frank sets out with his trusty chainsaw and a doubtful Charlie to find evidence to implicate Mac in the murders. In search of another suspect, Dennis and Dee do a little role-playing in order to help themselves better understand who they might be dealing with.

Part 1 of 2. Mac and Charlie fake their deaths to avoid the wrath of Mac's father who was released from prison and is out for vengeance.

The Gang gets Freudian as they step into the therapist's office to work through their mountain of issues, but when Dennis thinks he has everyone figured out, the shrink turns the tables on him and exposes the insanity in his unique brand of pop psychology.

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.