There’s no escape from Philly in It’s Always Sunny season 13 teaser After a grueling year-and-a-half wait, the return of It’s Always Sunny in Philadelphia is finally upon us and has released a new teaser, that can be viewed in the player below which continues the season’s spoofing of the Friday the 13th franchise as a killer-type character in a hockey mask hides in a tent as Philadelphians overtake the tent. The Gang Returns–mostly–in the 13th season of the FXX original comedy series It’s Always Sunny In Philadelphia, Mac (Rob McElhenney), Charlie (Charlie Day), Dee (Olson) and Frank (Danny DeVito) return to their duplicitous, scheming ways at Paddy’s Pub, while Dennis (Howerton) takes on the new role of father in North Dakota.