On the heels of successfully escaping a deadly digital trap, the members of the Justice League emerge in their own world to discover that Grimm, ravenous creatures from Remnant, have overtaken Earth! In order to defeat the monsters, they must call on their new friends – Team RWBY – for help!

The DC universe's premier superhero team are transported to the world of Remnant and turned into teenagers. They must team up with Team RWBY to uncover the mysterious alterations of their planet and defeat a superpowered Grimm.