In “Hades,” Zagreus, the son of Hades, must repeatedly escape the underworld to learn about his mother, Persephone. Each time Zagreus makes it to the end of the underworld, he must best Hades to get to the world of mortals. As Zagreus continues to defeat his father, their relationship morphs as Hades' opinions of his son and his former lover, Persephone, evolve.