Mac sets out to challenge the validity of the union between a post-op Carmen and her husband on the claim that it is a gay marriage.

Dennis comes to the realization that marriage is not how he imagined it to be, and he wants out.

The guys purchase a boat to party and experience life on the high seas.

After correctly answering a radio trivia question, Mac finally makes it big. Meanwhile, the Reynolds start their own internet podcast.

After getting kicked out of an exclusive swim club, Mac and Charlie attempt to fix up an abandoned pool that they used to enjoy as children. Frank, Dennis, and Dee try to enjoy the services at a public pool.

After burning down her house, the guys think Mac's mom should move in with Charlie's mom. Meanwhile, Frank decides to take care of a sick Dee.

When the guys learn that Dee is pregnant, they attempt to piece together what transpired at last year's Halloween party to figure out who's the father.

The gang decides to expand the group and Dee reevaluates her future.

Dee becomes a substitute teacher and takes the class on a field trip to see the guys' interpretation of the Lethal Weapon series.

Charlie begins to crack from the pressure of keeping Paddy's basement rat free so his friends decide to throw him a surprise party.

En route to Atlantic City for a charity event, Mac, Frank and Dee get lost. Meanwhile, Dennis and Charlie hitch a ride to town.

With the impending arrival of Dee's baby, the guys try to figure out who the father is by having a party for all her past flings.

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.

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.