The Calamitous Black Devils is set during World War II and follows the exploits of an elite brigade of Army operatives-the Black Devils. The team is composed of mostly American and Canadian soldiers, joined by MI-6 and the Russian Night Witches. Their mission is to stop a top secret Nazi plot to harness a multidimensional gateway that will allow an Ancient One, Anan-Zaha, to cross over into our world. But while battling the Nazi forces, the team is pulled into another world against their will. They must fight their way through Nazis, the undead, aliens, and ancient gods, trying to make their way back home.