He owned his own lab where he built war machines that he built for his boss, Gozaburo Kaiba. When Seto Kaiba took over (in which the Big Five joined forces with him), he burned down Nesbitt's lab, as Seto wanted to make games at Kaiba Corp rather than machines for war.After they joined forces with Maximillion Pegasus to take over Kaiba Corp, and Pegasus was defeated by Yugi Muto, Seto fired the Big Five, but they trapped him in a virtual world, but when their Five God Dragon was destroyed, they were imprisoned in the virtual world instead. Their bodies were destroyed eventually, but they soon found Noah Kaiba in his virtual world, and worked for him to steal the bodies of Yugi and the gang. Ota targeted Shizuka Kawai, who was with Ryuji Otogi and Hiroto Honda, but eventually decided on dueling the three of them at once, though he seemed intent at defeating Shizuka first (likely because she has never dueled before). Despite the fact that it was three on one, with Honda and Shizuka as the least experienced of the four, Ota gained the advantage. He destroyed Honda's deck master, sending Honda falling into a molten pit, trapping his mind in a robot monkey and holding his body in a virtual chamber. Nesbitt took the form of the Machine Sergeant as his deck master, and entered the field himself during the duel; he fused with Machine King into Perfect Machine King. He was defeated when he and Shizuka's fusion monster, Saint Jeanne, destroyed each other, but he stole Honda's body anyway and kidnapped Mokuba Kaiba, who was then taken from him by Noah.
Afterward, Konosuke Oshita, Shuzo Otaki, Chikuzen Ooka, and Kogoro Daimon entered Honda's body, and all five of them dueled Yugi and Jonouchi at once. Ota took over for one turn, but fell victim to Yugi's trap. After the Big Five were defeated, Noah imprisoned them each in a different corner of the virtual world.
Ota was killed along with Noah, Gozaburo, and the other members of the Big Five when Noah used a satellite attack to destroy the fortress that the virtual world was stationed in, deleting it and everyone inside it.
Yu-Gi-Oh! The Abridged Series
Nesbitt, like the other members of the Big Five, are board members in 4Kids working for Noah in LittleKuriboh's Yu-Gi-Oh! The Abridged Series. Nesbitt, as a robot, battles Tristan, Duke, and Serenity. Tristan falls into lava after defending Serenity from Nesbitt's attack. Then Nesbitt transforms into Super Giga Mecha Nesbitt, who has rocket power fists and battles Duke's theme song, in which he wins. However, Duke confuses Super Giga Mecha Nesbitt by reveals the protagonist of the new series Yu-Gi-Oh! Zexal confusing him overloading him causing him to self destruct.
In the next episode, he returns, possessing Tristan and kidnapping Mokuba for Noah. While possessing Tristan he does not sound like Nesbitt, but like Tristan dual voice effect to it, however he is identified and gives Kaiba the Darth Vader speech.
In Episode 54, he teams up with the rest of the Big Five to duel Yugi and Joey, but they are defeated, and Noah banishes them to the darkest corners of the internet. Nesbitt is sent to chat roulette, where he talks with Naruto like a robot.