Crude, controversial, outlandish, and downright hilarious. The gang's all back for a 5th season of FX's original comedy series It's Always Sunny in Philadelphia -. Come join Charlie (Charlie Day), Mac (Rob McElhenney), Dennis (Glenn Howerton), Sweet Dee (Kaitlin Olson), and Frank (Danny DeVito), the self-centered owners of Paddy's Pub in Philadelphia who will do just about anything