The elevator in The Big Bang Theory is broken down throughout the series.

So, to celebrate the yuletide season, we took a lot back at every Christmas episode of "The Big Bang Theory" to see which of Leonard, Sheldon, Howard, Raj ... and that kiss is an all-time classic ...

Besides his relationship with Penny, Leonard has flings and relationships with other women throughout "The Big Bang Theory." ...

Howard and Raj spend their time tracking down the house where some of the America’s Next Top Model contestants are staying. It’s the perfect episode for a good laugh. The Big Bang Theory is ...