The Zero Cannon is a satellite cannon orbiting Earth. Zero tried to obtain this weapon during the King of Fighters tournament in order to destroy the NESTS base and take over the world. While he could simply eliminate everyone and steal the weapon, he used the tournament as he needed the fighters to activate the cannon. The reactor of the cannon was under the floor of an underground temple in Southtown, as it siphoned the power of anyone who fought over it and sent the power to the cannon. After being defeated, Zero fires the cannon but it malfunctions, as the NESTS agents Diana and Foxy had changed the controls of the weapon. Kula Diamond, who was over the cannon, fired it instead, destroying Southtown completely. Afterward, the cannon is destroyed.

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