In an alternate universe, heroic versions of Lex Luthor and Joker (called the Jester) steal a device called the “Quantum Trigger” from the headquarters of the Crime Syndicate. When an alarm is tripped, the Jester sacrifices himself to allow Luthor to escape from the Syndicate. Luthor escapes to the Earth of the Justice League by activating a device that enables interdimensional travel.
The Justice League is summoned to a prison where Luthor is kept, and Superman‘s X-ray vision confirms Luthor’s reversed organs indicate that he is from a parallel Earth. The Justice League take the alternate Luthor to the Watchtower, where they learn of the Syndicate threat. As the Justice League debates the matter, Luthor hides the Quantum Trigger on the satellite. With the exception of Batman, the rest of the Justice League travel to Luthor’s Earth.
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