After a random school shootout leaves a scientist's daughter and the shooter dead, he uses nano-robots to look into a psychopath's memories to find reasons for violence and a way to treat it.
在另一个地球上，小丑使诈让超人杀死了露易丝·莱恩，致使英雄狂暴。 超人决定控制地球，蝙蝠侠和他的盟友不得不试图阻止他。
