Krona, an exiled Oan villain from the DC Universe who has gained the powers of entropy, begins destroying entire universes in his obsession to find out how they are created. The Grandmaster, an alien from the Marvel Universe who is obsessed with games, offers to give Krona the knowledge he seeks but only if he can beat him in a game. The game consists of forcing the Justice League and The Avengers to battle each other in a race to find twelve items of incredible power that have been hidden around both their worlds.
