Ugly Naugus

Ultra Naugus is a super form of Ixis Naugus generated by a large collection of specially formated super Power Rings created by Nate Morgan. When Ixis Naugus raided Nate Morgan's secret tundra lab, he, as well as Sonic and Tails, were infused with energies from a large cache of super magic rings. Ultra Naugus was seemingly invincible, however, Ultra Sonic and Hyper Tails were eventually able to defeat him.