“Vikings: Valhalla” Creator Jeb Stuart on Bringing a Little “Die Hard” Energy to the 11th-Century

Jeb Stuart’s Vikings: Valhalla, opens on a massacre in England. The victims, this time, are Vikings — a colony of Scandinavian descendants living on English soil since their raiding forebears put down unexpectedly peaceful roots. But a couple of generations down the line, King Aethelred (Bosco Hogan) is angrily denouncing an alleged Viking problem to his complicit nobles, and in what comes to be known as the St. Brice’s Day massacre, murders them all.