Megahertz resembles a large moth with strange, ear-like wings. His skin is mostly black, with white ridges running over it which appear to correspond to the positions of certain bones underneath, such as his ribcage and femurs. On his upper legs, Megahertz has a series of red bumps, which may be armor plating or a defense system.
Megahertz battled Junichiro Iwaki but was ultimately defeated.
Megahertz was the ninth monster to battle Greenman.
Megahertz has an extraordinary jumping capability. He also can weaken his opponents with his deadly gaze.