Heinrich Himmler, architect of the SS, spent years and Reich resources chasing a cup. This episode of Myth Hunters traces how the Nazi leader folded the Holy Grail legend into his fantasies of Aryan destiny, funding expeditions and research through the Ahnenerbe, his SS-run institute for occult and pseudo-historical study. Historians and researchers walk through the medieval Grail romances that fed Himmler's imagination, the castles and archives his agents combed across Europe, and the way Wagner's operas and volkisch mysticism primed him to see the relic as a source of literal power rather than symbolism. The film follows the trail to Wewelsburg Castle, which Himmler remade into a ceremonial center for SS ritual, and lays out how deeply fringe belief had burrowed into the machinery of the Third Reich. Archival photographs, expert interviews, and location footage build the case that this was not a minor eccentricity but a sustained, resourced obsession, one more strand in the regime's broader appetite for myth as a tool of control.