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“The Hofstadter Isotope” — While on a visit with Sheldon (Jim Parons, left) and Wolowitz (Simon Helberg, right) to a comic book store, a fellow comic book-loving pal of the guys begins romancing Penny, on THE BIG BANG THEORY, Monday, April 13 (8:00-8:30 PM, ET/PT) on the CBS Television Network
Photo: Greg Gayne/Warner Bros.
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