Watch TV Sitcoms - The Big Bang Theory Howard and Raj try to find the perfect match for Sheldon by setting him up on an Internet dating site. Seeing her moronic new boyfriend interact with the gang makes it abundantly clear to Penny that she can't go back to dating ...

Watch tv sitcoms - The Big Bang Theory A squabble over the thermostat setting leads to Leonard going over to Penny's and recounting for her the story of how he met and moved in with Sheldon. Alternate Videos

Watch TV Sitcoms - The Big Bang Theory Sheldon hosts a visiting female physicist, but her intelligence seems matched by her libido.

Watch TV Sitcoms - The Big Bang Theory Subsequent to Leonard and Penny's break-up, Sheldon tries to hide from Leonard and the gang that he had a friendly spaghetti dinner at Penny's.

Watch TV Sitcoms - The Big Bang Theory Sheldon gets to square off on the bowling alley against nemesis Wil Wheaton. Meanwhile, Leonard's miffed when Penny doesn't respond the way he hoped after saying, "I love you."

Watch TV Sitcoms - The Big Bang Theory Sheldon's fear of speaking in front of large groups threatens his ability to accept an award, so the gang tries to help him get ready for the big night.

Watch TV Sitcoms - The Big Bang Theory The discovery of a prop ring from The Lord of the Rings movies puts a strain on the guys' friendship. Alternate Videos

Watch TV Sitcoms - The Big Bang Theory An appearance in traffic court comes at the worst possible time for Sheldon—the same day Stan Lee is appearing at the comic book store. Alternate Videos

Watch TV Sitcoms - The Big Bang Theory Leonard faces a dilemma in choosing between Sheldon or Penny to accompany him to Switzerland to see CERN's Large Hadron Collider on Valentine's Day. Alternate Videos

Watch TV Sitcoms - The Big Bang Theory Stuck on the solution to a physics problem, Sheldon seeks a number of alternative approaches to change his thinking and free the mental block—including working with Penny at The Cheesecake Factory. Alternate Videos