After Mac wins a radio contest to score a goal on the Flyers' ice, he and Charlie train for the event - badly, while Dennis and Dee start their own radio program.
Charlie and Mac set up a truly odd couple after Mac's Mom burns the house down, while Frank discovers the importance of paternal care when Dee falls ill.
The gang gets a real 'scare' after Dee reveals she's pregnant, forcing the guys to recall their last hazy Halloween Party to determine if one of them might be the father.
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.
When keeping the basement rodent-free drives Charlie to the brink, the gang decides to put the cynicism aside and throw a surprise party to cheer him up.
Things go awry as the Gang travels to Atlantic City for a charity benefit. While Frank, Dee and Mac try to survive in the woods, Dennis and Charlie hitch a ride to the city and have the night of their lives.
Dennis and Dee decide to teach Frank a lesson "A Christmas Carol"-style, and Mac and Charlie learn some shocking things about their childhood Christmas traditions.