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In " The Blitzkrieg Button ," Howard Stark secretly returns to New York and asks Peggy Carter to retrieve a dangerous invention from the SSR—a device he calls the "Blitzkrieg Button," which he claims can cause a city-wide blackout. Fandango at Home

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This guide covers , titled "The Blitzkrieg Button." The episode originally aired on January 27, 2015 , on ABC. How to Watch