The Big Five

The Big Five, initially known at the "Board of Directors for Kaiba Corporation" are a group of five businessmen that used to work for Gozaburo Kaiba, producing weapons of mass destruction for KaibaCorp, and then later for Seto Kaiba making video game-related software.

KaibaCorp & Duelist Kingdom
When Gozaburo's step-son Seto decides to make his play for power, he convinces the Big Five he'll restore them to their former power and claims that Gozaburo does not give them the respect or power they deserve. The Big Five agree, and thus buy 49% of Kaiba Corporation. 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. Furious over their betrayal, the Big Five strike a deal with Maximillion Pegasus, similar to their previous deal with Seto: if Pegasus defeats Seto and Yugi Mutou in duels, then they will use their 49% to vote Pegasus into power of the company by kidnapping Seto's brother Mokuba, who has been entrusted with the security codes to the two percent the Big Five need.

However, the plan fails, and when Seto learns of their betrayal he threatens to fire them. The Big Five offer Seto his complete Virtual Reality game as a peace offering, sparking the Legendary Heroes arc. After being rescued, what Seto did to the Big Five is not known (in the manga, they were fired and were never seen again). Presumably their minds were trapped in the Virtual World as they had intended to do to Seto, as this sets the stage for their next appearance.

Virtual Realm
For some time, the Big Five wander Kaiba Corporation's computer banks until they are found by Gozaburo's biological son Noah. Noah also desires to take control of Kaiba Corporation from Seto, and the two strike a deal. Noah lures Seto, Yugi and his friends to an underground military base, and there forces them to enter his version of the Virtual World. The Big Five greet them and reveal the deal they have made with Noah: after being trapped in the Virtual World, they have lost their connection to their bodies and thus need new ones. In exchange for being allowed access to the bodies of Seto, Yugi and his friends, the Big Five will defeat each of them in a duel.

One by one the Big Five fail to defeat their chosen opponents, and Noah is furious. As a last ditch effort, the Big Five use the body of Tristan to unite into one and duel Yugi and Joey in a two-on-one match. They once again fail to defeat them, and are summoned back to Noah's headquarters. Noah refuses to give them a third chance, and as punishment seals each of the Big Five in an isolated portion of the Virtual World. Following this they are never seen again and are presumably deleted when the fortress the Virtual World is stationed in explodes.

Gansley
Gansley, known in Japan as Konosuke Oshita is the former vice-president of KaibaCorp and the leader as well as the founder of The Big Five. He chooses to duel Yugi, and claims to have perfected a strategy to defeat him. He approaches the duel as a business, referring to his monsters as his employees. In the English dub, Gansley gives Yugi advice on business while in the Japanese version, he quotes various warlords and philosophers on how to build a successful army. Another interesting change between the English and Japanese versions of the anime is that while his Japanese counterpart knows about Yami Yugi (he refers to them as Type-A Yugi and Type-B), Gansley shows no knowledge of the spirit.

Gansley uses a Reptile/Water Deck that relies on summoning many monsters to use the ability of his Deck Master Deep Sea Warrior called "Reflector Hole" which negates an opposing attack and inflicts damage to the opponent equal to the attacking monster's ATK at a cost of two Tributes.

In the Japanese version, he is voiced by Noboyuki Saitou in the Virtual Realm arc and by Shintaro Sonoda in the Noah arc.

Crump
Adrian Rudolph Crump III, known in Japan as Shuzo Otaki is the former KaibaCorp accountant who oversaw the company's finances before he was fired. He took the form of Nightmare Penguin to duel Téa. Crump was neglected as a child, but found a love for penguins when he read about how they cared for their young. His dream was to build a penguin theme park, but Seto Kaiba refused to finance the project.

Crump uses an Ice Deck that relies on various Water-themed cards. His Deckmaster Nightmare Penguin can increase the ATK of each water monster by using his Deckmaster's abilities.

In the Japanese version he is voiced by Satoshi Tsuruoka in the Virtual Realm arc and by Ryousuke Ootani in the Noah arc.

Johnson
Johnson, known in the Japan as Chikuzen Oka, was the legal advisor for the KaibaCorp and an expert lawyer. To lure Joey to a duel, he disguised a setting of the blimp and disguised himself as Mai until he reveals himself. He duels Joey Wheeler in a courtroom setting. Johnson claims that Joey is on trial for gambling too much with his deck and takes the form of Judge Man to duel. During the duel, Johnson secretly rigs Joey's coin flips and dice rolls in his favor, until Noah steps in and threatens to disqualify him for cheating. Joey asks that Noah let the duel continue, and Noah does so. Joey plays another game of chance with Johnson in which he loses one of the true or false questions he claims to be an expert in, and thus loses the duel.

Johnson uses a Fusion Deck' that relies on increasing his Life Points in order use his Deck Master's ability "Clear the Courtroom" which can destroy all monsters on the opposing field at a cost of 1000 points.

In the Japanese version he is voiced by Shin'ichi Yashiro.

Nesbitt
Nesbitt, known in Japan as, Soichiro Ota, was the technical expert of KaibaCorp and oversaw the military factories before Seto took power. Seto ordered Nesbitt to destroy his lab after coming to power and had him build the Duel Tower in its place. Nesbitt is furious over his technological genius being used for games, and has vowed revenge. Nesbitt took the form of Robotic Knight and later Perfect Machine King to duel Duke, Serenity and Tristan in a three-on-one duel. As Tristan and Serenity have little knowledge of dueling, Nesbitt is sure he'll win easily. He manages to defeat Tristan before losing, and unfairly claims his body in the process.

After taking over Tristan's body, Nesbit confronts Seto and fences him with a wooden pole (Nesbit: "En garde!"). Yugi and his friends arrive at the scene, and Joey smashes Nesbit into an garage. Nesbit rides a motorcycle through the crowd and kidnaps Mokuba. Later, Nesbit had to hand Mokuba over to Noah.

Nesbitt uses a Machine Deck. His Deckmaster's special ability is Final Artillery, which deals 500 points of damage to his opponent's Life Points each time he discards 1 Machine-Type monster from his hand. In a Tag-Team Duel, he was evidently able to choose which opponent took each hit of 500 Life Points of damage.

In the Japanese version he is voiced by Hiromi Sugino.

Lector
Lector, known in Japan as Kogoro Daimon, was the former assistant to Gozaburo himself and later Seto. Lector is the best duelist of The Big Five and challenges Seto as his opponent, intending to settle a personal grudge. Lector claims that he did all the hard work to make Seto look good for Gozaburo while all Seto did was give him orders. Lector also reveals Seto's manipulation of Mokuba to oust Gozaburo from power, which Seto denies.

Lector uses a Control Deck and utilizes a wide array of cards that lockdown the opponent's abilties, highlighted by his Deck Master Jinzo.

In the Japanese version he is voiced by Eiji Takemoto in the Virtual Realm arc and by Shoji Izumi in the Noah arc.

The Big Five United
When they faced Yugi and Joey, the Big Five dueled as one in the body of Tristan Taylor, rotating their Deck Masters in turn, as well as which member of The Big Five had control, until they reached Lector, with his Deck Master, Jinzo. In this duel they use a deck of their combined powers, highlighted by Five-Headed Dragon, the monster they attempted to used to trap Seto in the Virtual World before he fired them.