Season
- Season 0 2007-09-04
- Season 1 2005-08-03
- Season 2 2006-06-28
- Season 3 2007-09-12
- Season 4 2008-09-17
- Season 5 2009-09-16
- Season 6 2010-09-15
- Season 7 2011-09-14
- Season 8 2012-10-09
- Season 9 2013-09-02
- Season 10 2015-01-12
- Season 11 2016-01-04
- Season 12 2017-01-03
- Season 13 2018-09-05
- Season 14 2019-09-25
- Season 15 2021-11-30
- Season 16 2023-06-06
- Season 17 2025-07-09
Season 17 Episode
- Season 4 Mac and Dennis: Manhunters
- Season 4 The Gang Solves the Gas Crisis
- Season 4 America’s Next Top Paddy’s Billboard Model Contest
- Season 4 Mac’s Banging the Waitress
- Season 4 Mac and Charlie Die (1)
- Season 4 Mac and Charlie Die (2)
- Season 4 Who Pooped the Bed?
- Season 4 Paddy’s Pub: The Worst Bar in Philadelphia
- Season 4 Dennis Reynolds: An Erotic Life
- Season 4 Sweet Dee Has a Heart Attack
- Season 4 The Gang Cracks the Liberty Bell
- Season 4 The Gang Gets Extreme: Home Makeover Edition
- Season 4 The Nightman Cometh
It's Always Sunny in Philadelphia - Season 4 Episode 13 The Nightman Cometh
8.28 48 minutes In the season finale, Charlie gets the gang to help him put together a rock opera based on his song "Nightman."
