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.

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

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.

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".

With Charlie under his wing, Frank cleans up so he can get his hands dirty and help out his old company with one last big merger. An unwritten rule of the bar gets the rest of the gang caught up in a case of mistaken identity.

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.

A routine trip to a convenience store places the gang in the middle of an armed robbery.

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

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.

Dennis and Frank square off against Dee and Mac for control of the mountain, while Charlie learns that the slopes have their own set of rules.