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.

It's Always Sunny in Philadelphia: Season 4 - 13 Episode s

4x1 - Mac and Dennis: Manhunters
September 18, 2008
Charlie and Dee have been stealing Frank's delicious meats, so Frank leaves out human meat to get back at them. Driven by their cannibalistic needs, Charlie and Dee go in search of human flesh. Mac and Dennis harass Frank for hunting defenseless animals and think it would be much more badass to hunt something that could fight back ... like a human.
4x2 - The Gang Solves the Gas Crisis
September 18, 2008
Charlie, Mac, and Dennis formulate a plan to take advantage of the rising gas prices. By purchasing excess amounts now, they can sell it in the future and profit. As usual, things don't go as planned. Dee is also out to make money when she learns that Bruce is going to give the family fortune to a Muslim cultural center. She and Frank try to stop him and get the cash for themselves.
4x3 - America’s Next Top Paddy’s Billboard Model Contest
September 25, 2008
Due to the gang's latest "business expenses," Paddy's is in dire need of money. Frank buys a billboard to advertise the bar, but Dee decides to create a viral video to post on YouTube for promotion. Charlie quickly joins her, leaving Frank and Mac to hold a contest for some hot models to feature on the billboard. Naturally, Dennis joins the competition to prove his worth.
4x4 - Mac’s Banging the Waitress
September 25, 2008
Charlie finds out that the waitress has been seeing someone. He calls on Mac, his so-called best friend, to find out more information about the guy and to beat him up. However, it turns out that Mac is the guy the waitress has supposedly been seeing. Dennis, heartbroken that he's not Charlie's best friend, tries to win him over.
4x5 - Mac and Charlie Die (1)
October 2, 2008
Part 1 of 2. Mac and Charlie fake their deaths to avoid the wrath of Mac's father who was released from prison and is out for vengeance.
4x6 - Mac and Charlie Die (2)
October 2, 2008
Part 2 of 2. Dennis, Frank, and Dee find unique ways of coping with the apparent loss of their friends.
4x7 - Who Pooped the Bed?
October 9, 2008
Charlie and Frank awake to find poop in their bed. Neither will confess to being the owner, so they, Mac, and Dennis try to scientifically deduce who dropped the deuce. Dee wants to do something a bit more sophisticated, so she invites the waitress and Artemis to a girls' night out.
4x8 - Paddy’s Pub: The Worst Bar in Philadelphia
October 16, 2008
A newspaper critic is kidnapped by the gang after he calls Paddy's pub the worst bar in Philadelphia.
4x9 - Dennis Reynolds: An Erotic Life
October 23, 2008
After discovering Dennis' erotic memoir, Mac and Frank attempt to make some money off of it. Meanwhile, Dee and Charlie decide to spend a day in each other's shoes.
4x10 - Sweet Dee Has a Heart Attack
October 30, 2008
After Dee suffers a heart attack, she and Dennis try to live a healthier lifestyle. Meanwhile, Charlie and Mac take corporate jobs to get health insurance.
4x11 - The Gang Cracks the Liberty Bell
November 6, 2008
The gang fudge history by claiming that Paddy's Pub was responsible for cracking the Liberty Bell in an attempt to turn their dive into a Philadelphia landmark.
4x12 - The Gang Gets Extreme: Home Makeover Edition
November 13, 2008
Hoping to make their own dreams come true, the gang sets out to give an unexpected family an extreme home makeover.
4x13 - The Nightman Cometh
November 20, 2008
In the season finale, Charlie gets the gang to help him put together a rock opera based on his song "Nightman."

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It's Always Sunny in Philadelphia - Season 4

It's Always Sunny in Philadelphia: Season 4 - 13 Episode s

4x1 - Mac and Dennis: Manhunters

4x2 - The Gang Solves the Gas Crisis

4x3 - America’s Next Top Paddy’s Billboard Model Contest

4x4 - Mac’s Banging the Waitress

4x5 - Mac and Charlie Die (1)

4x6 - Mac and Charlie Die (2)

4x7 - Who Pooped the Bed?

4x8 - Paddy’s Pub: The Worst Bar in Philadelphia

4x9 - Dennis Reynolds: An Erotic Life

4x10 - Sweet Dee Has a Heart Attack

4x11 - The Gang Cracks the Liberty Bell

4x12 - The Gang Gets Extreme: Home Makeover Edition

4x13 - The Nightman Cometh

It's Always Sunny in Philadelphia: All seasons

S0: Specials

S1: Season 1

S2: Season 2

S3: Season 3

S4: Season 4

S5: Season 5

S6: Season 6

S7: Season 7

S8: Season 8

S9: Season 9

S10: Season 10

S11: Season 11

S12: Season 12

S13: Season 13

S14: Season 14

S15: Season 15

S16: Season 16