Nezbitt Nezbitt , known as Soichiro Ota in the Japanese version , was an engineer and formally the chief technical officer at KaibaCorp who oversaw the company ' s research and development activities . He was in charge of Technical Engineering of the military weapons KaibaCorp originally made , and later the virtual reality Duel Monster system and video game software initiated by Seto Kaiba . Design . Appearance . Nezbitt is tall and has brown hair . Like the other members of The Big Five , he wears a business suit . In the virtual world , he takes the appearance of Robotic Knight and later Perfect Machine King . Personality . Nezbitt is a misanthrope who believes that machines are superior to humans . His fascination with machines is reflected in his deck and his choice of taking on the form of a Machine - type monster in the Virtual world . He also tries to behave like a robot in his speech . He is also extremely brutal , as seen when he takes over the duel against Yugi and Joey , palming Johnson by the face and shoving him aside . Voice and mannerisms . In the 4Kids version , Nezbitt often speaks in a monotone tone with a robotic like dialect . In his " Robotic Knight " / " Perfect Machine King " forms , he has a computerized voice . He tends to do machine puns on his speech . Biography . KaibaCorp . Nezbitt worked as at KaibaCorp , where he oversaw the military factories . Nezbitt , along with 4 other KaibaCorp employees , formed a group known as the Big Five . Seto Kaiba , the adoptive son of the head of KaibaCorp , Gozaburo Kaiba , convinces the Big Five that Gozaburo is mistreating them and he ' ll help restore them to their former power . The Big Five agree , and thus buy 49 % of KaibaCorp . Combined with 2 % that Gozaburo had previously given to Seto for a test to prove his business skill , the Big Five vote out Gozaburo and vote in Seto as the president of the company . However , Seto quickly backs out on their deal , stripping them of their power and leaving the Big Five little more than figureheads and consultants . Seto ordered Nezbitt to destroy his lab and had him build the Duel Tower in its place . Nezbitt was furious over his technological genius being used for games , and vowed revenge . Duelist Kingdom . Furious over their betrayal , the Big Five strike a deal with the president of Industrial Illusions , Maximillion Pegasus in an attempt to overthrow Seto . If Pegasus defeats Seto and Yugi Muto in duels , then they will use their 49 % to vote Pegasus into power of the company by kidnapping Mokuba Kaiba , who has been entrusted with the security codes to the two percent the Big Five need . The Big Five later watches the duel between Yugi Moto and Maximillion Pegasus on the monitor . The Big Five and Pegasus ' plan fails , after Pegasus is defeated by Yugi . In the manga , Nezbitt and the rest of the Big Five are fired by Seto and are never seen again . Legendary Heroes . In the anime , the Big Five avoid being fired , by making excuses and offering Seto his complete virtual reality game as a peace offering . Eager to try out the virtual reality game , Kaiba refrains from immediately firing them and enters the virtual world . The Big Five trap Kaiba in the virtual reality . However Kaiba is rescued by Mokuba , Yugi , Joey , and Mai Valentine . The Big Five reprogram the game and set the " Mythic Dragon " as the final boss . However it is defeated by Yugi and Kaiba ' s " Dragon Master Knight " . Virtual Realm . After losing in Legendary Heroes , the Big Five got trapped in the virtual world , instead of Kaiba . Here they meet up with Noah Kaiba . Having Seto as a common enemy , they made plans for revenge . During the Battle City tournament , Noah has the KaibaCorp blimp sucked into an undersea fortress , where the virtual world ' s main servers are . They force Seto and Mokuba Kaiba , along with Yugi and his friends into the virtual world again . Using an altered set of " Duel Monsters " rules , involving Deck Master s , the Big Five duel their enemies in the hopes of stealing their bodies to escape the virtual reality . Nezbitt took the form of " Robotic Knight " to Duel Duke Devlin , Serenity Wheeler , and Tristan Taylor . He initially planned on dueling them 1 at a time , starting with Serenity , but Duke and Tristan talked him into a three - on - one Duel . Since Tristan and Serenity had little knowledge of Dueling , Nezbitt was sure he ' d win easily . With Nezbitt easily lowering Serenity ' s Life Points , as she doesn ' t know how to play , Tristan worries and uses his Deck Master to protect Serenity from an attack from Nezbitt . This causes Tristan to lose and Nezbitt has him ejected from the arena . Nezbitt plays his Deck Master , himself , onto the field and combines himself with his " Machine King " to form his new Deck Master " Perfect Machine King " . Due to " Clockwork Night " , his opponent ' s monsters were all Machine - Type , therefore powering - up " Perfect Machine King " . However Serenity manages to Summon " St . Joan " and she and Duke , with the help of Tristan ' s last card manage to raise the ATK of " St . Joan " equal to " Perfect Machine King ' s " ATK and defeat it , hence defeating Nezbitt . Since Nezbitt at least managed to beat Tristan , he steals his body , leaving Tristan ' s mind in the body of an " Acrobat Monkey " . In this form , Nezbitt attacks Kaiba with a , but is attacked by robot Tristan . He kidnaps Mokuba , for Noah , and escapes on a motorcycle . Before leaving to the real word , the other members of the Big Five protest that Nezbitt didn ' t rightfully win Tristan ' s body , so Noah allows the five of them to share it in order to Duel Yugi Muto . Should they win , they would all get their freedom . The Big Five face Yugi and Joey Wheeler , using Tristan ' s body . The 5 , each switch control and Deck Master throughout the Duel . Nezbitt only takes full control for 1 turn , where he uses " Heavy Storm " to destroy Yugi ' s " Mirror Force " , unknowingly raising the ATK of " Des Volstgalph " in the process , he then attacks " Des Volstgalph " with " Machine King " , only to have " Machine King " destroyed . Towards the end of the Duel , the Big Five uses " Dragon Revival Ritual " to combine their Deck Masters into the " Mythic Dragon " again . The dragon is destroyed by Yugi and Joey ' s " Mirage Knight " , but the Big 5 use " A Deal with Dark Ruler " to make " Berserk Dragon " their Deck Master . Ultimately , it is destroyed by " Dark Magician Knight " , costing them the Duel . Noah refused to give the Big Five any more chances after that . In the Japanese version , Noah deleted Nezbitt and the other members of the Big Five . In the dub , Noah imprisoned the Big Five in the different corners of the Virtual World until it was destroyed . Waking the Dragons . While Nezbitt does not return after being destroyed by Noah , he is seen accompanying " Gozaburo Kaiba " in Alister ' s flashback . Since it is later revealed that the man who Alister saw was Dartz pretending to be Kaiba , it is unclear if Nezbitt was actually present or just another illusion . Deck . Anime . Nezbitt uses a Machine Deck centering on " Machine King " and its evolved form " Perfect Machine King " . Nezbitt combines " Clockwork Night " with " Short Circuit " , transforming all enemy monsters into Machine - Type s and forcing them into Attack position , the transformation of the monsters to Machines further strengthening his " Machine King " . Nezbitt also makes use of his Deck Master , " Robotic Knight ' s " special ability Final Artillery , which lets him discard his other Machine monsters to inflict 500 damage to his opponent .