Shiwan Khan, a rogue protégé of the Tulku, arrives in New York inside the sarcophagus of Genghis Khan. As Khan's last descendant, Shiwan plans to fulfill his ancestor's ambitions of world domination. He proposes an alliance to Cranston, who refuses. Cranston acquires a rare coin from Khan, and learns that it is made of bronzium, a metal that theoretically could generate a nuclear explosion. He also learns that Margo's father—a scientist working on energy research for the War Department—has become uncharacteristically reclusive and aloof. Cranston deduces that Khan has hypnotized Reinhardt to create an atomic bomb.