This is strictly between the Zombies & Justice League.
- Both sides are fighting to save their respective universe. This means they are fighting to the best of their abilities.
- Anything goes in this particular encounter as long as the opponent is unable to battle/move (incapacitation), die, knockout, or even battlefield removal.
- Both sides of no knowledge on each other and are seeing each other for the first time in their lives.
- Neither side came with preparation, or battle plans, but they are aware they are in the fight for their lives.
- The winner has their respective universe saved, the losers have theirs destroyed.