Season 5 · Episode 13 · Overall #100
The Recombination Hypothesis
Aired January 19, 2012 Directed by Mark Cendrowski Written by Story by : Chuck Lorre | Teleplay by : Bill Prady & Steven Molaro
About This Episode
Leonard and Penny get back together in a hypothetical scenario that turns real. The on-again, off-again cycle takes a hopeful turn.
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