After plenty of speculation, details are out about It’s Always Sunny in Philadelphia’s next big musical episode, and it sounds like a true return to (terrible, terrible) form for the gang. Fans of the show are undoubtedly setting their expectations high, remembering Always Sunny’s seminal episode “The Nightman Cometh.” And the cast is surely hoping to capture that same lightning in a bottle of outrageous, dark humor. The long-running series is returning to the song-and-dance genre in its 12th season for an episode titled “The Gang Turns Black.” In addition to being a musical episode, the half hour will also be tackling the body-switcher genre. According to Uproxx, the episode’s official plot summary reads: “After an electric heating blanket shorts out while the gang watches The Wiz, they look in the mirror and realize they’ve turned black. They have to figure out how to get back to being themselves by going through all the classic body switch movie shenanigans they encounter.” Watch the promo above for a sample of the new original music and scenes from the episode. The series returns January 4 on FXX.