The show is called "It's Always Sunny in Philadelphia," but someone forgot to mention that to Los Angeles.

Driven by whipping winds (strong enough to turn the umbrella of a homeless person in a wheelchair inside out), heavy rains drench the FX comedy's sets in the once-elegant, now-ramshackle Los Angeles Herald Examiner building in downtown.

Buried deep in the dripping interior are the sets for Paddy's Pub, the fictional Philly Irish bar owned and operated by four childhood pals: Charlie (Charlie Day), Mac (Rob McElhenney) and siblings Sweet Dee (Kaitlin Olson) and Dennis (Glenn Howerton).

On this day, the cast is working on the ninth episode of the second season, which begins on Thursday, June 29, after a short run on corporate sibling FOX, which began June 11.

Joining the cast this year is comedy veteran Danny DeVito, who's appearing in all 10 episodes. It's a reunion of sorts for him with FX President John Landgraf, who used to run DeVito's Jersey Television.

Today, DeVito's a little worried about the story line, in which the gang exploits a stain in the bar office that looks like the Virgin Mary.

"I don't know what my Italian Catholic sisters will say," DeVito says.

But, he adds, "They don't mean anybody any harm. They're trying to make a few dollars on the stain. Who's to begrudge us that? And by the way, it does look like her."

He plays Frank, the father of Dennis and Dee, who has left behind his life of wealth and success to reconnect with his Philly roots.

"He wants to go back and get really down and dirty again," DeVito says. "Like he says in one show, 'I used to live like this in squalor and filth.'"

Part of Frank's rationale is that he has to hide his money from his predatory ex-wife, Barbara, played by guest star Anne Archer.

"One of the things Frank thinks about a lot is his wife's happiness," DeVito says. "He really does not want her to have any happiness, no matter what. It's a two-way street. She's done some things that I won't tell you right now, because you're going to watch the show. It's not always the man who's at fault. In this case, for sure she's the bitch."

"Mostly [the season] has to do with Frank," McElhenney says. "We watch Frank's progression through the season, as he becomes more and more of a degenerate."

"He buys into our lifestyle," Day says.

"He devolves back into us," McElhenney says. "So by the last episode, he's an animal."

Despite having a career that spans television and movies, both in front of and behind the camera, DeVito says his "Sunny" experience is "right up there. It's a little off the charts, this one. ... It's up there in the top echelons of my experience."

"Danny has been on a television series," Day says. "He's been a movie star; he's directed movies. There's nothing left for him but to have fun, and I think that's what he's doing."