Located underneath the Knightsdome Sporting Complex, within the sewers, the OMAC Base is the hidden lair of Brother Eye, within which it controls the OMAC army rampaging through the streets above. Locating the hidden base, Batman sends Fire and new heroes while the Joker sends Killer Frost and new villains to shut Brother Eye down. During the mission, Fire panics and Killer Frost flees leaving the heroes or villains to face Brother Eye alone.