The cast of "The Big Bang Theory."The CW/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Johnny Galecki stars as Leonard on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Jim Parsons stars as Sheldon on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Kaley Cuoco stars as Penny on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

Kaley Cuoco stars as Penny and Jim Parsons stars as Sheldon on "The Big Bang Theory."CBS/Warner Bros. International Television - Tuesday, August, 25, 2009, 6:25 PM

When Leonard (Johnny Galecki, right) and Sheldon (Jim Parsons, left) meet new neighbor Penny, Leonard is excited, but Sheldon is less enthusiastic for he feels his friend is only chasing a dream he'll never catch, on The Big Bang Theory.CBS/Greg Gayne/Warner Bros. - Wednesday, December, 26, 2007, 8:26 PM

Leonard (Johnny Galecki, pictured second from left), Sheldon (Jim Parsons, pictured far right), Wolowitz (Simon Helberg, pictured second from right) and Koothrappali (Kunal Nayyar, pictured far left) undertake a challenging and dangerous experiment, attending the Halloween party being thrown by their hot neighbor, Penny (Kaley Cuoco, not pictured) on The Big Bang Theory.CBS/Ron Batzdorff/Warner Bros. - Wednesday, December, 26, 2007, 8:26 PM

Kunal Nayyar stars as Kothrappali in The Big Bang Theory. CBS/Robert Voets - Monday, September, 24, 2007, 7:24 PM

The CBS comedy The Big Bang Theory comes in at No. 4 on the Yahoo! TV Buzz list proving that nerdy is the new sexy. How else would you explain it? (Premieres Monday, Sept. 24)CBS/Monty Brinton - Wednesday, September, 5, 2007, 10:5 PM

Kaley Cuoco stars as Penny in The Big Bang Theory.CBS/Robert Voets - Tuesday, July, 31, 2007, 9:31 PM

Johnny Galecki stars as Leonard in The Big Bang Theory. CBS/Robert Voets - Tuesday, July, 31, 2007, 9:31 PM

Jim Parsons stars as Sheldon in The Big Bang Theory. CBS/Robert Voets - Tuesday, July, 31, 2007, 9:31 PM

Simon Helberg stars as Wolowitz in The Big Bang Theory.CBS/Robert Voets - Tuesday, July, 31, 2007, 9:31 PM

A scene from The Big Bang Theory.CBS/Greg Gayne/Warner Bros. - Wednesday, May, 16, 2007, 11:16 PM

A scene from The Big Bang Theory.CBS/Greg Gayne/Warner Bros. - Wednesday, May, 16, 2007, 11:16 PM