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.
The gang goes on a road trip to the Grand Canyon.
Seeing the effects of the recession, Mac and Dennis try to find a way to keep Paddy's pub going. Meanwhile, Frank and Dee go into business together.
When Frank's behavior becomes even more outlandish than usual, the gang decides to stage an intervention.
As the Waitress prepares to get married, Dee is jealous that she isn't a bride to be. Meanwhile, the guys try to reintroduce a broken hearted Charlie into the dating scene.
The gang tries to get out of paying a parking ticket that they received on the evening of the final game of the 2008 World Series.
The gang puts together a wrestling show for returning troops. Meanwhile, Dee finally meets the solider that she has been communicating with over the internet.
The gang decides to expand their business by developing a number of products that they could sell at Paddy's pub.
Mac and Dennis decide that they need to spend some time away from each other. Meanwhile, Charlie helps Dee search for her cat.
Dennis teaches the guys his comprehensive seduction system that will help them gain the undying love and devotion of any woman. However, Charlie struggles to utilize what he just learned, while Mac and Frank decide to go in their own direction. Meanwhile, Dee fears that her boyfriend might be using a similar system to play her.
When Mac and Charlie learn that Dee has gotten a part in M. Night Shyamalan's next film, the two see this as a perfect opportunity to pitch their screenplay.
The gang is once again eligible to compete in the Flipadelphia, a flip cup tournament after being banned from it for 10 years. However, the gang's old rivals have moved on with their lives.