“The Gorilla Experiment” — Sheldon (Jim Parsons, left) attempts to help Penny (Kaley Cuoco, right) understand Leonard’s work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend, on THE BIG BANG THEORY, Monday, Dec. 7 (9:30-10:00 PM, ET/PT) on the CBS Television Network.
Photo: Michael Yarish/Warner Bros.
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