Superman answers a call for help from the freedom fighters on the planet Apokolips, and must battle Darkseid and his parademons in order to free the slaves called Lowlies, and get them to safety.
Lex Luthor wants Superman out of the way, so he busts the Parasite out of jail and gets him to drain Superman's powers--and it is up to Lois Lane and Jimmy Olsen to free him.