S4 | E9 The Big Bang Theory 20 min • Expires February 4 Penny asks Leonard to lie to her visiting father, while Howard, Raj and Bernadette spend all night looking through a telescope. ..

S4 | E7 The Big Bang Theory 20 min • Expires February 4 The rest of the gang is interviewed by the FBI for Wolowitz's security clearance with Sheldon accidentally letting slip some damaging information. ..

S3 | E18 The Big Bang Theory 20 min • Expires January 28 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. ..

May 3, 2019 · Johnny Galecki chooses his favorite Big Bang Theory episodes. Johnny Galecki found that The Big Bang Theory episodes that showed Leonard's emotional evolution and romantic side rose to the top. More >

Brilliant physicist roommates Leonard and Sheldon meet their new neighbor Penny, who begins showing them that as much as they know about science, they know little about actual living.

Penny becomes addicted to an online game based on the world of Conan the Barbarian and persistently pesters Sheldon for advice.

Sheldon won't tell anyone why he's never mentioned Tam, his childhood best friend, so Leonard takes matters into his own hands. Bernadette and Penny take out Raj's fiance, Anu, for dinner to get the skinny on her.

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie so he forms his own team hoping to prove he's superior.

In the series finale, Bernadette and Howard leave their kids for the first time; Penny and Leonard try to keep a secret; Sheldon and Amy stick together; and Raj makes a new friend, as the gang travels together into an uncharted future.

Leonard volunteers to sign for a package in an attempt to make a good impression on Penny, but when he enlists Sheldon for help, his attempt at chivalry goes terribly awry.