It's Always Sunny in Philadelphia

The gang learns something when Charlie must use a wheelchair; Dennis and Dee's estranged father returns to town.

The gang uses unorthodox measures to save the bar from an overzealous business neighbor; Dennis and Dee's mother returns to town and makes Frank's life miserable.

Dennis and Dee quit their jobs and concoct a plan to go on welfare; Mac and Charlie suffer the consequences when Dennis and Dee quit.

Barbara becomes jealous of Frank's new relationship with Dee and Dennis and that he's been dating; she tries to seduce Mac for revenge.

Dee agrees to take boxing lessons from Frank after being mugged; Mac and Dennis enter Charlie in an underground street fight match; Dee and Charlie dabble with performance enhancing supplements.

Mac, Dennis, Charlie and Dee are given community service for the arson mishap; Frank's attempt to bond with Dennis backfires.