By Marc Bernardin
Updated August 07, 2009 at 05:21 PM EDT

If you’ve been a faithful viewer of FX’s gloriously filthy, positively puerile “sitcom” It’s Always Sunny in Philadephia, then you know the tale of the Nightman, the Dayman’s mortal enemy, an anti-hero that Charlie (Charlie Day) brings to life in song when he and Dennis (Glenn Howerton) form a rock band. And you also know that in the fourth season of Sunny, Charlie wrote a full-blown stage musical — called The Nightman Cometh — about the mental and physical abuse that lead to the creation of the Nightman.

Well, boys and girls, The Nightman Cometh is comething to a city nearish you: Starting Sept. 15, in Boston, the entire cast of Sunny — Howerton, Day, Rob McElhenny (Mac), Kaitlin Olson (Sweet Dee), Mary Elizabeth Ellis (The Waitress), Artemis Pebdani (Artemis) and, yes, Danny Devito (Frank) — will be performing Nightman on stage. They’re hitting Boston, New York City, San Francisco, Seattle, Los Angeles and, natch, Philadelphia.

There are few things I’d want to see live more than Nightman. Maybe a bear fighting an elephant. Or an elephant fighting Carrot Top. But if you’re thinking what I’m thinking, then grab a buddy…cause we’re going on a field trip!

Who’s coming with us?