It's Always Sunny in Philadelphia - Season 4 (2008)
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13 Episodes
S4 E7-Who Pooped the Bed?
S4 E10-Sweet Dee Has a Heart Attack
S4 E13-The Nightman Cometh
Videos: Trailers, Teasers, Featurettes
93% 
8.8 Cast
Synopsis
The fourth season of It's Always Sunny in Philadelphia, premiered on FX on September 18, 2008. The season contains 13 episodes and concluded airing on November 20, 2008.
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