Bio:
a group of "ugly" mutants living underneath the city of New York. Originally tracked down by a homeless Nightcrawler thanks to information given to him by Pyro. Originally the group was being led by Sunder and his second-in-command Callisto. After a battle with the X-Men Nightcrawler became the leader of the group.
#81 - 'Cliffhangers' #82 - 'The Underneath: Part 1' #83 - 'The Underneath: Part 2' #90 - 'Apocalypse: Part 1' #91 - 'Apocalypse: Part 2' #92 - 'Apocalypse: Part 3' #100 - 'Ultimatum: Part 3'