After reminiscing about high school, the guys conclude that it would be a public service if they allowed teens to drink in the bar, thus providing a safe and controlled environment for teens to party. Feeling that she missed out on a lot as a teenager due to having to wear a brace for her scoliosis, Dee begins dating a high school jock.

The guys buy a gun after the bar's safe is stolen.

Mac and Dennis befriend a patron found dead at their bar in order to win the affection of his granddaughter.

When the gang learns that they are in danger of losing their bar due to a zoning mishap, they resort to some outlandish and extreme methods to prevent that from happening. Meanwhile, Frank isn’t too happy when his wife returns to town.

After quitting their job due to Frank's continuing interference, Dennis and Dee decide to seek alternative income by going on welfare. Meanwhile, Mac and Charlie must now bear the consequences of their friends’ departures from the business.

Barbara hooks up with Mac to make Frank jealous, which leads to retaliation from Dennis.

Frank runs into an old adversary at the gym when he begins teaching Dee to box after she was robbed. Hoping to make some extra money on the side, Mac and Dennis make preparations for Charlie to compete in an underground street fighting match.

After being arrested for arson the gang is sentenced to do community service. Frank makes an effort to connect more with Dennis. Meanwhile, Charlie is also ordered to attend AA where he makes a startling discovery that might be beneficial in his ongoing quest to hook up with the Waitress.

Mac and Dee become uncomfortable when the rest of the guys decide to make some extra money by exploiting the similarities between a water stain and the Virgin Mary. A reunion with someone from the past, stirs up forbidden feelings within Dee.

Driven by Frank's insight into the world of politics, Dennis pursues a political career by running for office.

Dennis and Mac make a decision to take away all rules concerning moral and behavioral etiquette at Paddy's after an argument about the Constitution. Frank uses the decision and it's following consequences to his own gain. Meanwhile, Charlie tries to convey his love for America by protesting while Dee attempts to reaffirm her goal of being an actress.

Dee receives e-mails from a stranger claiming to be her and Dennis' real father. Meanwhile, Mac decides to visit his father who is in prison.

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.

When an experiment successfully multiplies Charlie's intellect and takes him away from the bar, the rest of the gang find themselves struggling to complete the menial "Charlie Work" that has kept the bar running for so long.

After creative differences over what constitutes tasteful nudity cause Frank to pull his money out of "Lethal Weapon 6" during filming, Mac, Dennis, and Charlie screen their rough footage for investors in hopes of raising enough capital to finish the production of their latest masterpiece.