Underground Monsters

The Underground Monsters are a group of humans that were experimented on by Shredders Foot technicians, and turned into monsters capable of surviving deep underground. Atleast seven are known and three have official names: Quarry, Stonebiter and Razorfist. The other four are a Underground Spider Monster, Underground Insectoid Monster, Underground Scorpion Monster and Underground Cyclops Monster. The effects of the Moon Crystal found in the Underground City can revert them back into humans.