Subterranean People

The Underground People (地底人達 Chitei Hitotachi) are the self-proclaimed "True People of the Earth". They are ruled by the Underground King and live under the earth's crust, but grew too much in numbers and planned to take over the surface. They were eventually stopped and chased back into the ground by Saitama.

Appearance
The Underground People have a humanoid appearance. They are very large with hands the size of a regular human's head. They only have two toes on each feet, and three fingers on their hands. They wear golden or metallic ornaments, wristbands, necklaces and armor over their right shoulder. They all wear different metal helmets, with only their round eyes showing.