Screen Junkies was lucky enough to visit the set of It’s Always Sunny in Philadelphia, which is gearing up for its seventh season set to hit FX on a September date TBD, and the stars of the boundlessly outrageous comedy were nice enough to share details, including upcoming storylines, guest stars, and exactly why Rob McElhenney is looking a little heftier these days.

Here’s the IASIP season 7 scoop, in convenient list form:

  • Rob McElhenney gained 50 pounds this year just for the “sheer comedy” of playing Mac as a fat guy. And it’s working. “It’s been disgusting to watch him go through with this adventure,” said Charlie Day. “We were a little on the fence about it for his own personal health and safety,” he added, “but it has definitely made Mac a lot funnier.”

  • They’re doing a realistic Pretty Woman storyline. That is, Frank will propose to a hooker.

  • There will be a children’s beauty pagaent. If that doesn’t horrify and delight you, you’re not watching enough Toddlers & Tiaras.

  • Says Day: “With 2012 coming up, we’re gonna be tackling the apocalypse.” The end of the world. I’m sure the gang will handle it with logic and aplomb.

  • They’re going to the Jersey shore, but they carefully crafted the episode so it’s not about Jersey Shore.

  • Actual guest stars include The Wire star Lance Reddick, Jason Sudekis reprising his role as the gang’s long-lost member, and Jon Polito as Frank’s brother.

  • Non-actual guest stars include, joked Day, a “pretty famous” guy whose name “rhymes with ‘Osama.'”

  •  We’ll see more of The Waitress (perhaps because Mary Elizabeth Ellis’s other show, Perfect Couples, got canceled), which means more of Charlie’s emotional torture.

  • The Kings of Leon are coming by to appear in a “Glee-esque” episode. (Which is appropriate because after proposing to a prostitute, Frank’s “sex” will probably be painfully “on fire,” ifyouknowwhatI’msaying.) 

  • The overall message of the set visit: “Darker” and “more of the same.” Can’t wait!

(Image courtesy of FX)