|This article is about a/an evil mecha in Choudenshi Bioman.|
Thunder Megas (サンダーメガス Sandāmegasu, 42) is a Neo Mecha-Gigan of Neo Empire Gear, piloted by Monster
A Neo Mecha-Gigan that absorbs electricity to use for attack, mainly in a beam attack fired from its coils.
Thunder Megas is utilized by Monster as part of a plot to use a dam power plant taken over by Gear to empower it for combat. However during its initial battle with Bioman, the battle between it and Bio Robo leads to the destruction of a nearby nature preserve and hurting the birds living nearby. Angry at the destruction, Gou attacks the plant and removes Monster and Zyuoh's influence before Bioman fight the Neo Mecha Gigan again, ultimately defeating it with the Bio Particle Cut.
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