"The Hot Troll Deviation" is the fourth episode of the fourth season of the US sitcom The Big Bang Theory and the 67th episode of the show overall. It first aired on CBS on October 14, 2010. In the episode, Howard and Bernadette go on a date following their breakup a few months prior. Sheldon and Raj engage in a series of "tit for tat" exchanges when working together.
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