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The Big Bang Theory Season 3, Episode 9, "The Vengeance Formulation," follows Sheldon’s failed revenge against Barry Kripke after a public prank and Howard’s commitment struggles with Bernadette. Directed by Mark Cendrowski, the 2009 episode features guest stars including Katee Sackhoff and Ira Flatow. For detailed episode recaps and cast information, visit TV Fanatic . "The Big Bang Theory" The Vengeance Formulation ... - IMDb