Time passes, and Seth has finally adopted an inmense body and an incredible strength. His sheer power is more than enough to take several blows without even getting fazed. On the other hand, a single blow delivered by Seth could destroy brick walls in itself. Always taking care of his family, Seth takes advantage of his powerful status to earn jobs as bouncers or bodyguards. Seth was the ultimate line of defense, and his abilities were soon to be noticed by a certain organization.

Approached by several people, Seth is offered to join a certain agency that deals with weapons development. Deeming it as nearly harmless, Seth accepts. Before beginning his new job, Seth is given a rather extravagant medical treatment. Soon enough, Seth gets to know his boss: a certain fellow named Ling. Seth was now in the mercenary business. Working part time as a professional hitter, Seth convinces himself that this should be the perfect job. But not everything was settling for him. Upon further inspection, Seth became conscious about the several biological experiments at work in his own organization. Unable to ask in fear of losing his job, Seth follows orders silently.

One faithful day, Seth is asked by commander Ling to join Benimaru Nikaido and Shingo Yabuki in order to fight in the next King of Fighters tournament, which he will be holding in order to lure NESTS out of their hole. NESTS sounded familiar to Seth, but he was ready to set out on his journey. His contact would be Vanessa, a sexy yet deadly woman that was also a skilled fighter. She would go after K' and Maxima, fugitive NESTS agents, herself, and Seth would follow Benimaru and Shingo, former teammates of K' and Maxima. NESTS will no doubt be after both duos since they frustrated their plan last year. Arranging the last details of the misson, Seth and Vanessa continue their paths.

Before Seth can rejoin his old friend Benimaru, he first has to go to the mountain range in China to find a certain ninja that would be most interested if he ever told him about NESTS. When he gets there, Seth is received by haunted village people and skeptical wanderers who dare not give Seth information about the man he seeks. Finally, Seth's track leads him to a nearby waterfall, where he hopes to find the person he has been searching for. The person referred to doesn't last long to appear. It is a tall, skinny ninja, with a dead man look in his eyes, and strange, ominous aura surrounding him. Seth previewed his obscure intentions, but tried talking to the man anyway. No use, as the ninja takes no time in trying to eliminate Seth as quickly as possible. Seth uses his great agility to avoid all of Lin's deadly blows, enough to amuse Lin enough and finally convince him to join him, as he would bring Lin to NESTS. As it was foretold, Lin was interested in Seth's plan. Seth then travels to Japan, and finally joins his friend Benimaru, and his partner, the young Shingo. It was now time to get in the tournament!

Not surprising, Seth was more than enough to plow through several opponents, or leave them in bad shape for the next one in line. His sheer strength and skill have gained him and his team a place in the final battle. Ling comissions Seth to meet at Southtown, since there is where NESTS is supposed to be hiding out. Seth guides the others, and awakes some suspicions in Lin's eyes. Upon arriving at the abandoned factory in the industrial zone of Southtown, Seth is surprised to see Vanessa, who was also told to meet in the same place. Before realizing what was going on, the whole building was crawling with NESTS soldier. Seth fends the soldiers off as his friends escape to a secluded dark room. Seth follows suit, only to realize they have fallen into a trap....

The most impressive revelation up until then was that Ling was no other that one of NESTS high-ranked officers, Zero, who had taken Ling's identity, and later finished Ling off. More to Seth's surprise was the fact that he and Vanessa were injected with Zero's genetic code in order to become ever-stronger. Enraged by the fact they were used, Seth vows to make Zero pay. Seth's strength now matches with Zero's dark abilities. Seth may be at a disadvantage, be he plays a major role in toning Zero down for K' to deliver the final blow. After Seth realizes that the Zero Cannon, one of his agency's most devastating weapons, was about to fire upon Southtown. So, he leads his partners to freedom before Southtown is blasted to bits.

When Seth awakens after the explosion, more than the ruins that the city was left in, Seth was more worried by the mysterious ninja assaulting Lin and Benimaru. Seth had definetly seen him before around his headquarters, but he never knew that that sort of bio-weapon was such in late stages of development. Seth is now very expectant about NESTS' next action, and how to stand against it, fearful it might be too late....

The time came, one year later, for Seth to claim payback on NESTS. He regrouped with Vanessa and planned their next move. Vanessa told Seth that she had Ramon by her side, but they were still missing one partner. It would be tough since both Vanessa and Seth's former partners had already found a team to stay in. Then, Seth had a crazy, but practical idea. He would push his luck by asking the only man who he knew would still not have a team to fight in the King of Fighters tournament: the dangerous and unpredictable Iori Yagami. Seth left to propose Iori his new offer.

When Seth finally caught up to Iori, the rumors were proven true: Iori really did not like having company around, and Seth could feel his cold, yet terribly powerful aura. Seth began to sweat cold as Iori replied furiously to Seth's questions regarding the King of Fighters tournament. It was almost like the ground shaked whenever Iori made a statement. But Iori finally accepted only out of sheer boredom and his burning desire to bury Kyo. Seth wonders what Iori really has in store for them this tournament.

Seth used his cunning and intelligence to trace the steps of NESTS through out the tournament, while he was realizing a decent role in the tournament. The huge powerhouse was a force to be dealt with, after all. Finally, Seth gets to experience the final downfall of NESTS as their space station explodes and falls from the skies to their fiery demise. Seth once again leads his team to safety, but he has another plans for Iori as they reach to shore: he had to terminate him before Iori would present more trouble. Seth and Vanessa stand poised to do away with Iori, who just slumps his shoulders, and beckons for the others to come. Seth knows this task would prove to be harder than anything they had ever faced before, but he attacks Iori, sure that he can do something to stop Iori's crazed ways.

Seth isn't precisely the world's most friendly man. His toughness and brute strength reflects a rude and insensitive man, but deep inside, he tends to see to his partners' welfare. Seth is very homesick, but he tries to keep his mind off nostalgia by fighting constantly. Seth admires his partner Vanessa's determination, and Seth himself hopes that one day he can finally call quits with NESTS once and for all.