When a spaceship splashes down in Gotham Harbor, Batman and Superman encounter a mysterious Kryptonian with powers as great as Superman's. When Darkseid gets wind of this, he has the Kryptonian abducted and brought under his control on Apokolips. It's up to Batman and Superman to retrieve the Kryptonian, forcing them to infiltrate Darkseid's hostile world where superpowerful threats lurk around every corner. This story is based on Jeff Loeb's popular mini-series from the Superman/Batman comic books.