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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- Premiered: September 24, 2007
- Rating: TV-PG
- Premise: Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the… (more)