The Big Bang Theory : The Vengeance Formulation (2009)
Directed by Mark Cendrowski / Chuck Lorre / Bill Prady / Maria Ferrari / Richard Rosenstock
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Synopsis by Bill Ecklund
Sheldon is humiliated on National Public Radio and vows vengeance on Kripke; and Wolowitz begins a relationship with Katee Sackhoff, who appears in a cameo. Ira Flatow also makes a cameo appearance.