The Super-Crisis That Struck Earth-Two! On Earth-Two, four beings are given super-powers by mysterious black spheres, and thus Gem Girl, How Chu, Money Master, and the Smashing Sportsman are born and begin to terrorize various cities in the world. While at the headquarters of the Justice Society of America, the group is welcoming Robin into their ranks when they receive reports of the various criminals rampages. While Robin and Wildcat fight the Smashing Sportsman, Mr. Terrific and Hawkman take on Money Master, Wonder Woman takes on Gem Girl, and Hourman against How Chu. Each one is easily defeated by their opponents and are forced to retreat back to JSA headquarters. There they find Johnny Thunder with his Thunderbolt. Johnny suggests that they call in their friends the Justice League from Earth-One to help them on their current case. When the Thunderbolt brings Superman, Flash, Green Arrow, and Green Lantern, where were just in a battle against similar beings on their own Earth. The Thunderbolt explains to all that the spheres originates from a dark matter universe and in order to survive they needed to be absorbed into a human host. However, as a side effect they would be turn the human evil. The JSA and JLA decide to team up and learn how to solve this menace that is plaguing both their worlds.