Watch The Big Bang Theory Season 3 Episode 21 online via TV Fanatic with over 6 options to watch the The Big Bang Theory S3E21 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and TBS.
|YouTube Purchase||Watch Now|
|Google Play||Watch Now|
Sheldon has a female physicist, Dr. Plimpton (Judy Greer) spend the night at the apartment.