Defeated in combat by Superman, Mongul, the ruthless master of War World, can only regain his throne by once again fighting his greatest adversary ... and winning. Lobo, an intergalactic bounty hunter, is dispatched to bring the Man of Steel to the fight -- with the threat of a thermonuclear device that will turn the Earth to dust should Superman refuse. What can the Man of Tomorrow do but accept Lobo's invitation, joining him on an interstellar lawbreaking spree. Obviously Superman has a plan ... Superman always has a plan. Now if only the Justice League can figure what it is!