The Joker is required for all matches in battle 4.
Challenge: Second Special Attack Disabled!
There is a glitch in this match that causes the disabled special red Xs to appear on all power bars, but special 1 and super is not actually disabled.
Challenge: Countdown! (2:00)
Challenge: Radiation! (1% max health lost every second)
This match may award a copy of Batman/Beyond Animated.
Challenge: Regeneration! (enemies heal by 1% max health every second)