Crisis On Earth-Two! The combined efforts of the Justice League of America of Earth-One and the Justice Society of America of Earth-Two continue to try and stop the combined forces of the Crime Champions, a collation of villains from both Earths. The Earth-Two Atom and Hourman go after the Fiddler robbing a museum, Hawkman and Black Canary go after Wizard, and Doctor Fate goes after the Icicle. Martian Manhunter, Green Arrow, and the Earth-One Atom go after Felix Faust, Batman and Wonder Woman go after Doctor Alchemy, and Superman and Aquaman go after Chronos who is stealing a clock from a lighthouse.
While both Green Lanterns seek to save the captured Flashes each of the other members of each respective group fails in defeating the various villains. The heroes manage to defeat their foes at first, but soon find themselves quickly defeated and trapped in cages in space just like the Flashes, due to a trap set there set off by the arrival of the Green Lanterns whose energies provide the remaining power needed to spring the trap.
However their imprisonment is short-lived when the two Green Lanterns are able to shrink themselves down to size to get out of their prison at the Earth-One Atom's suggestion, they then use their combined power rings and the super speed of both Flashes to free the others. The Crime Champions realize what has happened, and the Fiddler thinks there must be an Earth-Three they can escape to, which they try to find. Then the combined efforts of both the Justice League and the Justice Society defeat the Crime Champions. With their opponents defeated, both groups part company for their own worlds, taking their respective criminals back with them.
