The Earth Empire Beasts are the monsters deployed by the Underground Empire Tube. These creatures originate from deep beneath the Earth, sealed away within ancient frozen caverns until Tube releases them for battle.

Many are formed through a fusion of Dogler creatures and parasitic organisms, creating grotesque and powerful hybrid monsters designed for conquest. When defeated at human size, they are enlarged by Okelampa and forced into giant combat against the Maskmen's mecha.

Each beast reflects the dark, subterranean nature of Tube's empire, combining monstrous biology with the mysterious power of the underground world.