S4 E1 - Mac and Dennis: Manhunters
S4 E2 - The Gang Solves the Gas Crisis
S4 E3 - America’s Next Top Paddy’s Billboard Model Contest
S4 E4 - Mac’s Banging the Waitress
S4 E5 - Mac and Charlie Die: Part One
S4 E6 - Mac and Charlie Die: Part Two
S4 E7 - Who Pooped the Bed?
S4 E8 - Paddy’s Pub: The Worst Bar in Philadelphia
S4 E9 - Dennis Reynolds: An Erotic Life
S4 E10 - Sweet Dee Has a Heart Attack
S4 E11 - The Gang Cracks the Liberty Bell
S4 E12 - The Gang Gets Extreme: Home Makeover Edition
S4 E13 - The Nightman Cometh
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.
Streaming, rent, or buy It's Always Sunny in Philadelphia – Season 4:
Currently you are able to watch "It's Always Sunny in Philadelphia - Season 4" streaming on Hulu or buy it as download on Google Play Movies, Apple iTunes, Amazon Video, Vudu, Microsoft Store.