The DC universe's premier superhero team are transported to the world of Remnant where they are transformed into teenagers and must join forces with Team RWBY to fight against superpowered Grimm.

Superman, Batman, Wonder Woman, Flash, Cyborg, Green Lantern and Vixen are transported to the strange world of Remnant and find themselves turned into teenagers. Meanwhile, Remnant heroes Ruby, Weiss, Blake and Yang must combine forces with the Justice League to uncover why their planet has been mysteriously altered before a superpowered Grimm destroys everything.