Watch The Big Bang Theory Season 3 Episode 15 online via TV Fanatic with over 5 options to watch the The Big Bang Theory S3E15 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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When Leonard is giving a plus one to go to Switzerland to see the Large Hadron Collider on Valentine's Day, Sheldon tries to convince Leonard to take him over Penny.