Season 4 · Episode 10 · Overall #73
The Alien Parasite Hypothesis
Aired December 9, 2010 Directed by Mark Cendrowski Written by Story by : Chuck Lorre & Steven Molaro & Steve Holland | Teleplay by : Lee Aronsohn & Jim Reynolds & Maria Ferrari
About This Episode
Amy and Penny deal with unexpected physical attraction — not to each other. Sheldon is baffled by the biological response.
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