The Zard Empire is a war loving race of reptilian humanoids on a parallel world in Mazinger. While little is known about them, one thing that is certain is that they see war as the only way to live. As a result, they are only a military nation with only killing and conquering as their objectives.
When the High King of Lithgor called for a treaty of peace with the Empire, he met them with officials from his kingdoms. However the Zard warriors slaughtered everyone of Lithgor with the exception of Princess Krishna and in one of attacks on her, came the savior of her kingdom, Mazinger. In the final battle with the Zard Empire, the Mazinger single handedly obliterates the Zard Empire while being catapulted back to his world.