The episode, called "The Nightman Cometh," was written by Rob McElhenney (Mac), Charlie Day (Charlie) and Glenn Howerton (Dennis), who all star along with Kaitlin Olson (Sweet Dee) and Danny DeVito (Frank) with special appearances by Mary Elizabeth Ellis (The Waitress) and Artemis Pebdani (Artemis).
It's billed as "a live stage adaptation of a fan favorite episode from season four in which Charlie writes a rock opera to woo his longtime obsession, The Waitress." LiveNation is behind the live tour.
The stage show originally premiered in Los Angeles last spring and, based on the success and fan buzz generated by the musical, producers decided to bring the live show on the road, according to LiveNation.
Following the performance, there will also be a screening of new episodes from the upcoming season of the FX network's "It's Always Sunny in Philadelphia."
The Nightman Cometh plays the Beacon Theatre in New York City at 8 PM Sept. 16, followed by dates in suburban Philly (Upper Darby's Tower Theater Sept. 19 at 8 and 10:30 PM), Seattle (Moore Theatre Sept. 22 at 8 PM), San Francisco (Nob Hill Masonic Exhibition Hall Sept. 24 at 8 PM) and Los Angeles (Hollywood Palladium Sept. 25 at 8 PM). For more information about the series, visit http://www.fxnetworks.com/shows/originals/sunny.