Season 5 · Episode 2 · Overall #89
The Infestation Hypothesis
Aired September 22, 2011 Directed by Mark Cendrowski Written by Story by : Bill Prady & Steven Molaro & Maria Ferrari | Teleplay by : Chuck Lorre & Jim Reynolds & Steve Holland
About This Episode
Penny's apartment gets bedbugs and she crashes with the guys. Sheldon's germaphobia kicks into high gear.
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