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Dee gets contacted by a man online claiming to be her real father; Mac goes to prison to his his father.
Dennis and Mac strip all rules from Paddy's bar; Frank takes advantage to bring in gambling; Charlie tries to prove his love for America by protesting while Dee joins to show her acting.
Frank encourages Dennis to run for office, while Mac tries to get him to drop out.
Mac and Dee become bother when the rest of the gang exploits a Virgin Mary water stain lookalike; a reunion with an old friend, "Rickey Cricket" sparks feelings in Dee.
After being arrested for arson, the gang is sentenced to do community service. Charlie is ordered to AA where he ends up with the waitress as his sponsor.
When Frank runs into an old rival at the gym, and he begins training Dee to fight the guy's daughter; Mac and Dennis prep Charlie to compete in an underground street fight.
Barbara hooks up with Mac to make Frank jealous; Dennis attempts to get revenge on Mac by sleeping with his mother.
After Frank's ownership is bothering the twins, Dennis and Dee quit their jobs and go on welfare; Mac and Charlie have to pick up the slack.
When the gang fears they move lose the bar to an Israeli, they go jihad; Meanwhile, Frank is unhappy to find his wife has returned to town.
When Charlie gets run over, the gang discovers the advantages of being handicap; Dennis and Dee's estranged father, Frank, re-enters their lives.