It's Always Sunny in Philadelphia (sometimes referred to as It's Always Sunny, Always Sunny or simply Sunny) is an American television sitcom that premiered on FX on August 4, 2005. It moved to FXX from the ninth season. It was created by Rob McElhenney, who developed it with Glenn Howerton. It is executive produced and primarily written by McElhenney, Howerton, and Charlie Day, all of whom star alongside Kaitlin Olson and Danny DeVito. The series follows the exploits of "The Gang", a group of self-centered friends who run the Irish bar Paddy's Pub in South Philadelphia. The series follows "The Gang", a group of five depraved underachievers: twins Dennis Reynolds (Glenn Howerton) and Deandra "Sweet Dee" Reynolds (Kaitlin Olson), their friends Charlie Kelly (Charlie Day) and Ronald "Mac" McDonald (Rob McElhenney), and (from season 2 onward) Frank Reynolds (Danny DeVito), the man who raised Dennis and Dee. The Gang runs the dilapidated Paddy's Pub, an Irish bar in South Philadelphia. Each member of the gang shows varying degrees of dishonesty, egotism, selfishness, greed, pettiness, ignorance, laziness, and unethical behavior; they are often engaged in controversial activities. Episodes usually find them hatching elaborate schemes and conspiring against one another and others for personal gain, vengeance, or simply the entertainment of watching another's downfall. They habitually inflict mental, emotional, and physical pain on each other and anyone who crosses their path. They also regularly use blackmail to manipulate one another and others outside of the group.