Superman, Batman, Wonder Woman, Flash, Cyborg, Green Lantern, and Vixen find themselves in the unfamiliar realm of Remnant, where they are transformed into adolescents. At the same time, Remnant’s own champions, Ruby, Weiss, Blake, and Yang, must join forces with the Justice League to unravel the mystery behind the sudden changes to their world, all while preventing a supercharged Grimm from wreaking havoc.