Oreo is the best-selling cookie in the world today. But few people remember the product that Nabisco blatantly ripped off: Hydrox. A creation of Kansas City’s Loose-Wiles Biscuit Company, Hydrox was billed as the “aristocrat of cookies,” with a novel combo of chocolate and cream filling. So why, more than a century later, is Hydrox still mistaken as a cheap knockoff? Producer Mackenzie Martin documents the rise and fall of America’s first chocolate sandwich cookie.