Captain X, a brooding, Byronic figure under the sea, was sometimes an enemy and sometimes an ally of the Sea Devils in the past. Why has he returned now with a fantastic new scheme involving Superman?
The combined forces of the Justice League of America, the Justice Society of America, and the Freedom Fighters — heroes from three different Earths — work together to save their worlds from a dangerous force called the Cosmic Tree! But can even the combined forces of the JLA, the JSA, and the Freedom Fighters stop its spread into other dimensions? Enjoy this untold team-up tale of the greatest heroes of Earth-One, Earth-Two, and Earth-X!