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The Big Bang Theory Season 8 Episode 20

When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument.

Episode Title: The Fortification Implementation

Air Date: 2015-04-09