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The fourth season of It's Always Sunny in Philadelphia aired in the fall of 2008 on FX. It ran for 13 episodes. It is available for purchase on DVD or iTunes.
The Gang's schemes get even crazier this season: reselling gasoline door to door, getting healthy and scamming to get health insurance, and having the bar declared a historical landmark. They also kidnap a newspaper critic who writes a negative review of Paddy's.
- Glenn Howerton as Dennis Reynolds
- Kaitlin Olson as Deandra Reynolds
- Rob McElhenney as Mac
- Charlie Day as Charlie Kelly
- Danny DeVito as Frank Reynolds
- Mary Elizabeth Ellis as The Waitress
- David Hornsby as Rickety Cricket
- Artemis Pebdani as Artemis
- Gregory Cummins as Luther Mac
- Lynne Stewart as Bonnie Kelly
- Sandy Martin as Mrs. Mac