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Yu-Gi-Oh! episode 16: "The Scars of Defeat"
Bandit Keith is the former U.S. Duel Monsters Champion. He was so successful in this profession, that his reputation earned him the nickname "Bandit Keith". Keith is one of the secondary antagonists (along with Yami Bakura) of Duelist Kingdom arc because of his grudge against Pegasus and his actions against Yugi and his friends.
During the final round of the Intercontinental Championship tournament in New York City, Keith was up against Maximillion Pegasus, who used his Millennium Eye to read Keith's mind and predict his moves. Afterwards he wrote something down on a piece of paper and calls over a kid named Sam from the audience. He tells the kid to Duel against Keith using the instructions on his note. Using it, the kid defeats Keith in one turn.
Keith, shocked and humiliated at being defeated by a child, fell into depression. He later sneaks into Duelist Kingdom to defeat Pegasus and reclaim his glory. 
In Duelist Kingdom, he trained three Duelists; Zygor, Sid and Bonz. He had Bonz Duel Joey Wheeler and lent him several rare cards, including "Call of the Haunted", to strengthen his Deck.  Although Keith directed nearly all of Bonz's moves, he still lost. Afterward, Keith called Bonz a loser and ignored Joey's challenge for a Duel face-to-face. After leaving the arena, Keith trapped Joey, Yugi Muto and their friends in the cave, then attacked his own minions and stole their Star Chips, giving him enough to enter the castle as the first finalist. 
Keith later Dueled Joey in the semifinals, using a Machine Deck. His Machine cards had superior firepower and immunity to any magical attacks. Keith cheated by pulling cards out from underneath his wristband to power up his monsters, but Joey still won. Afterwards, Keith claimed that Joey should be disqualified since the card he used to enter the semifinals was not his. Joey admitted that Mai gave him her card, but then asked how Keith knew that his card didn't belong to him. Pegasus chuckled and explained that Keith obviously stole the card, citing Keith's certainty that Joey would not be able to find his entry card, as evidence. Joey said that Keith should be disqualified, and Pegasus agreed, not just because of his thievery, but for "improper behavior taking place during the match" - namely, the cards beneath his wristband. Pegasus ordered his security guards to take Keith away. However, Keith broke away and confronted Pegasus. He pointed a gun at his head (the gun is removed in the dubbed anime) and demanded the prize money. Pegasus mocked Keith, saying that he had sunk to being the worst criminal scum since their Duel in America. Keith stepped forward, but Pegasus hit a hidden button on the floor with his foot, causing the floor beneath Keith to fall away, and dumping him into the ocean.
While struggling against the ocean currents, Keith was rescued by Rare Hunters, and fell under the control of Marik Ishtar. Disguised as a fortune teller, Keith asked Yugi Muto if he could see his Millennium Puzzle. When Yugi handed it over, Keith stole it and fled to a hidden arena. Chaining the Puzzle to the arena, Keith said the only way for Yugi to reclaim it was to Duel him. (In the English anime, Marik had Keith Duel Yugi to win the Puzzle for him. In the Japanese anime, Marik had Keith Duel Yugi in the hopes that Dark Yugi would appear.)
Although Keith was hooded, Yugi deduced his identity from his Machine Deck. At this point, Marik revealed that he and his Rare Hunters rescued Keith and took him under his control. Keith's Deck, augmented with rare cards, added by the Rare Hunters, as well as him hiding cards under his robe's sleeves, begins to overpower Yugi. However, the Duel was watched by Yami Bakura, who sensed the dark energies from Keith and realized he had been hypnotized. Refusing to let Yugi lose and forfeit the Puzzle, which he wanted for himself, he used the Millennium Ring to break Marik's control of Keith. While Marik and Keith struggled for control, Keith shattered the Puzzle against the console (In the English anime, he does this because Marik commands him to. In the Japanese anime, Keith does it himself because he thinks the voice trying to control him is the spirit of the Puzzle). Yami Bakura then swung down, knocking Keith off the arena.
While Yami Bakura left Yugi to put the Puzzle back together, Keith hallucinated that Marik was nearby, giving him orders. Grabbing a length of pipe and attacking the images, Keith shattered the arena power unit, causing a fire. While the building burned, Joey and Tristan broke down the door. Terrified, Keith ran past them, claiming the arena was haunted.
Waking the Dragons
As a professional Duelist, Keith has a large number of Decks which he keeps hidden inside of his jacket, consisting of several different Deck themes. During his time is Duelist Kingdom, he lends several cards to Bonz to fortify the young Duelist's Zombie Deck (including "Zanki" and "Crawling Dragon"), although Keith's Main Deck consists of all sorts of Machines as well as handful of Fiend Type Monsters. In his Duel with Yugi, he also uses rare and powerful cards provided by the Rare Hunters, including the legendary "Zera the Mant". Despite his reputation, he cheats by hiding cards in his wristband. Similarly, when he wears the Rare Hunter robes, a claw mechanism feeds cards directly to his hand. Because the Duelists are so far from each other when Dueling at an arena, Keith's opponents rarely realize he is cheating.
- ↑ talent.yahoo.co.jp profile
- ↑ Yu-Gi-Oh! episode 16: "The Scars of Defeat"
- ↑ Yu-Gi-Oh! episode 17: "Arena of Lost Souls, Part 1"
- ↑ Yu-Gi-Oh! episode 18: "Arena of Lost Souls, Part 2"
- ↑ Yu-Gi-Oh! episode 22: "Face Off, Part 1"
- ↑ Yu-Gi-Oh! episode 163: "Self Destruction"
- ↑ Yu-Gi-Oh! 5D's episode 1: "On Your Mark, Get Set, DUEL!"