Following the death of Jean Grey, the X-Men are reassembled by Professor X to travel to Japan following the abduction of Armor and face the U-Men who are abducting young mutants in order to harvest their organs. During their fight with the U-Men, the X-Men discover that some of the mutants in Japan are suffering from the "Damon-Hall Syndrome" which causes problems to mutants during their second mutation. Collects all twelve episodes of the Marvel/Madhouse collaboration.