The brave teenagers of Generation X must stop the ghosts of their teacher'spast. Before joining Banshee in training the young mutants of Generation X at Xavier'sSchool for Gifted Youngsters, Emme Frost led another group of neophytes: the Hellions,who were slaughtered while under her tutelage. Now her guilt over the death of her old students is threatening her new ones--asstrange ghostly manifestations that resemble the Hellions are wreaking havoc throughoutthe campus. They must be stopped, and the heroic Generation X mutants are the onlyones who can do it.