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The Metarex Gillman troops resemble brown piranhas with arms and legs
The Metarex Gillmans were encountered by Sonic the Hedgehog and his allies on a desert planet that was covered by oceans after its Planet Egg was removed. Their aquatic abilities gave them a brief advantage over Sonic, whom they captured and delivered to their superior Gillman's Boss. However, thanks to the inventiveness of Christopher Thorndyke, Sonic was able to triumph over the Gillman forces and destroy them.