The Big Bang Theory 2007 | TV Show

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Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated.

Premiered: September 24, 2007

Rating: TV-PG

User Rating:4.58 out of 5 (8,996 ratings)

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Season 2, Episode 23 The Monopolar Expedition

First Aired: May 11, 2009

In the second-season finale, Leonard gets ready for a three-month long science trip, and he and Penny come to terms with their feelings for each other.

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The Classified Materials Turbulence

Season 2, Episode 22

May 4, 2009

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The Electric Can Opener Fluctuation

Season 3, Episode 1

September 21, 2009

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