The Big Bang TheoryS02E23

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The Big Bang Theory : The Monopolar Expedition

S02, E23 (First Aired: May 11, 2009)

While Leonard prepares for a three-month science expedition, he and Penny re-evaluate their feelings for each other.

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S02, E22 (First Aired: May 4, 2009)

Penny makes a surprising revelation about Leonard while on her date with Stuart; Wolowitz finds a critical design flaw in his NASA project.

S03, E01 (First Aired: September 21, 2009)

After tampering with Sheldon's Arctic-expedition data, the guys follow him back to Texas, which threatens Leonard's chances for romance with Penny.

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