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.
With the garbage men of Philadelphia on strike, Frank concocts a plan to undercut the union and get the contract to collect the city's trash. But when The Gang's elaborate plan starts to fall apart, everyone will get their hands a little dirtier than expected.
Dennis and the gang crash Maureen's wedding to make certain he'll be able to sever all ties, only to discover a union much scarier than kissing cousins.
When Charlie and Dee invade the rarefied world of the 1%, they find a romantic connection with two members of one of Philly's wealthiest families. When they catch wind of the fancy dinners, tennis matches and big parties, Mac, Dennis and Frank try to get a piece of the action. But, when all the scheming comes to a head, the whole gang learns a lesson in love.
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. Dennis' psychology is exposed as abnormal indeed.
In perhaps the most depraved scheme of them all, The Gang rallies around Charlie's mom as she battles cancer. As Mac, Charlie, and Dee struggle with their faith, Frank loses his memory and his mind in a quest for buried treasure, and they're all rocked by a revelation that will shake Paddy's to its very foundation!
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. While an unwritten rule of the bar gets the rest of the gang caught up in a case of mistaken identity.
After slipping into an unhealthy obsession with computer games, The Gang wrestles to define the difference between the real and the virtual worlds.
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 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.
