The Justice League meets the Ultimen, a popular group of young heroes. The Ultimen discover they are the results of a government experiment in creating super humans and only have a short time to live. In frustration and anger, all but one Long Shadow strike out against the Justice League.

A trio of high school kids accidentally resurrect Solomon Grundy, reviving him more powerful than ever but with no memories of his past. Dr. Fate, Amazo, Aquaman, and Shayera assist League regulars stopping his rampage.