“The Zazzy Substitution” — Leonard (Johnny Galecki, left) and the guys are concerned as Sheldon (Jim Parsons, right) searches for an alternative to human companionship, and calls on his mother (Laurie Metcalf, center) to help, on THE BIG BANG THEORY, Thursday, Oct. 7 (8:00-8:31 PM, ET/PT) on the CBS Television Network.
Photo: Richard Cartwright/CBS
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