Batman and Superman regularly join forces against threats that neither could face as effectively alone. Alongside Robin, Supergirl, and other heroes from the DC Universe, they investigate conspiracies involving science, magic, parallel dimensions, and enemies capable of endangering far more than Gotham or Metropolis. Their relationship is built as much on their differences as on the deep trust developed through their missions. Between spectacular adventures, mysteries tied to the past, and battles against foes such as the Devil Nezha, the series explores the early years of their friendship while showing how their opposing methods ultimately complement one another.