'Big Bang Theory' four years: Cast celebrates at Paleyfest, but avoids spoilers

One of the biggest and most popular shows in television history is celebrating four years on the air, and a lot of difference can happen in just less than half a decade. "The Big Bang Theory" appeared at Paleyfest this week, and reports on Thursday, March 14, 2013, show that they have truly grown since their first time there in 2009.

Back when the cast appeared at Paleyfest in 2009, "The Big Bang Theory" wasn't even in the doemstic top 40. Now, they're the second most-watched show on all of television, coming in just behind "NCIS." That's because "The Big Bang Theory" is bringing in more than 20 million viewers per episode.

One of the things that has helped the series the most is that of syndication. No matter where you turn now, the show is on the air.

"You're kind of forced to watch the show now," joked actor Simon Helberg, one of the show's stars, Wednesday night on the PaleyFest arrivals line. "We're shoving it down people's throats, and then they're learning that they love that."

One of the more popular characters on the show is Sheldon Cooper, played by Jim Parsons, and he plays the role of a genius. Still, he can't seem to figure out just how successful "The Big Bang Theory" really has become.

"There's something impossible to fathom about viewers and numbers and things like that," Parsons explained. "I can barely picture 20 people in one room. If you want to say 17 or 18 million, well you've lost me."

Co-creators Chuck Lorre and Bill Prady were there along with other members of the cast for Paleyfest, but they were very careful in what they said. They didn't want to spoil anything or give away too much on the futures of "The Big Bang Theory."

"Well I think (Howard's) pants will probably be as skinny and probably a bit tighter," Helberg began. "I think that Sheldon will probably still be sitting in his spot. It may be in a different apartment. I think he'll sit in that spot until he's in a home. Howard and Bernadette probably will ... God, God help them if they have children. We know she hates them and we know that Howard, essentially, is a child. So I wish them luck."

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