Great Scott! It's a twisted time-travel tale of titanic tenure! In an attempt to get to the bottom of the mystery of the "demon," Robin the Boy Wonder and the Supergirl of Krypton venture back in time to China circa 1600 B.C. — running headfirst into the ancient superheroes known as the House of Ji! Meanwhile, Superman and Batman are losing a race against time to save their fellow superheroes from the schemes of a new villain... one simply known as the Devil Nezha.