Morgaine Le Fey's son, Mordred, turns on Morgaine and banishes her and all adults, including Blockbuster, Cheetah, KGBeast, & Copperhead, into another dimension. Superman, Wonder Woman, Green Lantern, and Batman are sent there, too, but Morgaine sends them back as children to combat Mordred. This also continues the story arc involving Batman & Wonder Woman. Dakota Fanning guest stars as Diana's younger self.
Baby Etrigan? Yeah. Comedy relief? Yep.