The X-Men are responding to a distress call from Muir Island. When they arrive, they find a disturbing sight: the corpses of a research team that had been operating on the island. The X-Men then find a dying Multiple Man and he was surrounded by a large group of dead dupes. Cyclops rushes to Multiple Man's aid, but it was too late for Multiple Man. With his dying breath, Multiple Man tells Cyclops that he and the research team had been researching the Terrigen Mists and had discovered that they were toxic to mutants.