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The Big Bang Theory S05E13

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The Big Bang Theory : The Recombination Hypothesis

S05, E13 ()

Everything could change when Leonard spontaneously invites Penny to a romantic dinner.

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Previous Episode

The Shiny Trinket Maneuver

S05, E12 (First Aired: January 12, 2012)

Amy is upset with Sheldon when he isn't impressed with her recent accomplishment; Howard struggles with Bernadette's aversion to children.

Next Episode

The Beta Test Initiation

S05, E14 (First Aired: January 26, 2012)

Penny and Leonard experiment with their new relationship; Raj forms a bond with his phone's virtual assistant.