Garugan

Garugan is an unused monster which was set to appear in the unmade 1974 Toho film Giant Monsters Converge on Okinawa! Showdown in Zanpamisaki. No official concept or images of the monster is known to exist, yet it is known that he was controlled by a race called the 'Garuga Aliens'. He was going to fight Godzilla, Anguirus and Mothra in Okinawa, and would ultimately be defeated by them.