Doomsday Castle: Castles have been hailed throughout history as the ultimate homes for kings and noblemen, shielding them from invasion by neighboring enemies. But for American prepper Brent Sr., this relic of medieval times represents survival if his greatest fear comes true - an electromagnetic pulse (EMP), where the power grid completely fails, plunging the country (and eventually the world) into chaos. He's hoping his castle, the ultimate bunker, will bring his family together and protect them if disaster strikes. But first he has to bring his family together to complete the castle ... if they don't destroy each other first! In National Geographic Channel's (NGC's) new summer series Doomsday Castle - marking the first true spin-off series in network history following the incredible popularity of Doomsday Preppers - Brent Sr. is summoning his children to finish the construction of his enormous, only half-completed castle isolated deep in the Carolina mountains in an undisclosed location, and to test their survival skills to find out if they each have what it takes to survive the coming apocalypse. Doomsday Castle premieres Tuesday, August 13, at 10 p.m. ET/PT

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Family, Reality-TV