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Zero is one of the higher-ranked Nests agents. Due to his rank, Zero managed to become one of the most important men among the Nests cartel, aiding them in their evil plans. However, power corrupts people, and absolute power corrputs absolutely. Always hungry for power, Zero was not satisfied with his current position. Anxious for more, Zero begins to create a plan that would involve the downfall of his superiors and his rise to power.
Zero began his true work when the Krizalid project had begun. Acting as the project supervisor, he was to monitor all actions done by Krizalid, and also analyze the performance of K', who is a human being infused with Kusanagi power. After Krizalid was defeated, Zero was the ominous voice who talked to the heroes of the battle. Zero considers Krizalid to be a worthless agent, and dispatches him by launching a huge boulder over Krizalid. After proclaiming the superiority of Nests, Zero retreats to seclusion once again....
During one full year, Zero begins the fabrication of what should be the most fearsome weapon ever created by man: the Zero Cannon. A killer satellite that would orbit the Earth in outer space, it would contain a huge laser cannon that would be able to fire at any designated spot on the ground. But this type of destructive energy needed an equally powerful energy source. Using the same technology that was used for Krizalid's battle armor, Zero fabricated a power generator that would be able to absorb the fighting energy of any human being. The generator would then channel the energy towards the Cannon, and power it up enough for it to destroy whole cities at once. Zero, drunk with ambition, plans to use this weapon against his own superiors. But he needs someone outside the organization to launch it, to avoid suspitions....
The Ikari Warriors proved to be the perfect target for Zero's evil plans. That way, he could avoid any possible investigation by his bosses. But there was no direct way to approach the mercenary squad. Taking notice of a fellow commander, and friend of the Ikari Warrior leader Heidern called Ling, Zero decides to take advantage of this. He eliminates Ling, and extracts his genetic code. Then, Zero molds a face at the perfect image of Ling, and succesfully manages to imitate Ling. His plan would soon begin....
Taking advantage of the friendship between Ling and Heidern, Zero launches the Zero Cannon to outer space, saying that it would be a weapon to use against Nests. After that, Zero suggests Heidern to organize a new King of Fighters tournament in order to attract Nests out of their hideout. In order to do so, Zero advises that Heidern should follow K' and Maxima, former Nests agents, who should be able to confess something about Nests' whereabouts. While Zero fixes that situation, he also makes some movements on his side. He dispatches two of the most important agents that worked for Ling, and sends them to attract the former members of the fighters of the faithful battle one year ago. Seth and Vanessa are assigned to search out for K', Maxima, Benimaru Nikaido, and Shingo Yabuki, and bring them to Southtown for the final battle. Zero's plan begins as scheduled....
But Nests has also moved their pieces. After sending the "anti-K'" Kula to stop Zero's plans, Nests plans to wipe their trace in Southtown. Meanwhile, as the tournament advances under the happy gesture of Zero, the final battle in Southtown nears. After Heidern realizes that things aren't going as planned, Zero puts the final part of his plan into motion. He captures Heidern using his soldiers, which posed as Ling's soldiers, to stop Heidern from any further interference. Now, Zero prepares himself for the final match in a temple located behind an abandoned factory in the industrial zone of Southtown.
When Maxima and the others arrive with Zero, he tells them his malevolent intentions. He even used his own agents, Seth and Vanessa, as pawns in his maniacal game. He injected them with his own genetic code to enhance their abilities so they could perform better in battle. Facing the rage and anger of many of the fighters in front of him, Zero manages to get one step closer. The warriors are so angry that they will fight with no drawbacks. This will gain him enough energy to charge the Zero Cannon!
During the battle, Zero manages to display two styles: one of them was pure strength and speed, using his power and his razor-edged skirt. The second part of the battle, when things suddenly got serious, Zero used dark arts in order to surprise his opponents, and even use his own fighting aura to create chaos around him. After wiping out practically all the resistance, Zero declares himself the winner, but not before Lin stabs him in the back. Furious, Zero gives Lin a sound beating, but now he has to face K'. Zero feels that his body doesn't reply to his commands anymore. The stab from Lin injected poison into his body, downgrading his physical status, allowing K' to deliver the final blow.
Badly wounded and enraged, Zero is ready to activate the Zero Cannon, since it should already have enough energy to blow his enemies to bits. However, the generator does not respond to his command inputs. Suddenly, Zero is inmobilized, and two mysterious women appear at his sides. They condemn Zero to death for trying to betray Nests. Amidst his anguish and pain, Zero watches how Kula activates the Zero Cannon from outer space. The beam falls on the temple itself, and Zero receives the impact head on. In his dying place, Zero delivers Whip the project data before finally being buried by the debris of the falling temple, with Southtown as his crumbled tomb.... Zero always desires incredible power. Not content with his incredible strength, among the best in the Nests cartel, Zero aims for higher goals, no matter who has to fall. He will destroy his enemies and allies alike to accomplish his dreams. Always taking advantage of the fighting sense and the feeling of the battle, Zero now vanishes, leaving behind his desire for infinite power.