Watch The Big Bang Theory Season 4 Episode 6 online via TV Fanatic with over 6 options to watch the The Big Bang Theory S4E6 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.
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A major secret abounds this week, as Leonard keeps quiet about an affair with Raj's sister. Will Sheldon keep the secret?