the simians are a race of war-like, wine-drinking, humanoid ape-like sentient beings. they built mechagodzilla, a robot duplicate of godzilla, as a tool for world domination. they do not seem to be capable of ultra-high technology like that of their predecessors, apart from the ability to construct a colossal machine such as mechagodzilla. simians can even change into a more human-like appearance. they established a secret base in okinawa, only to be discovered and killed by interpol agents. simultaneously, mechagodzilla is destroyed by the combined efforts of godzilla and king caesar.