Yu-Gi-Oh! 5D's (遊戯王5D's(ファイブディーズ), Yū-gi-ō Faibu Dīzu?) is a Yu-Gi-Oh! series which began to air in Japan from April 2, 2008, and replaces Yu-Gi-Oh! GX (broadcast as Yu-Gi-Oh! Duel Monsters GX in Japan). 5D's is also the first Yu-Gi-Oh! series to be broadcast in Widescreen.
Like the previous series, it focuses around characters playing the card game, Duel Monsters, despite the fact the 'Duel Monsters' tagline has been dropped from the Japanese title. This series introduces new types of cards that are reflected in the Official Trading Card Game. During the series, the main Duel Disk is a motorcycle called a "Duel Runner" ("D-Wheel" in the Japanese version) and the duelists engage in stadium games called "Turbo Duels" ("Riding Duels" in the Japanese version). Yusei Fudo, the 18 year-old main protagonist, has "Stardust Dragon" as his main card, which is the cover card for the Duelist Genesis trading card set.
Set in the future, the game of Duel Monsters has changed; a new addition has been introduced to the future of dueling as seen in 5D's: "Turbo Duels". These duels are played in giant stadiums, and duelists ride motorcycles with built-in duel equipment known as "Duel Runners". Domino City has also changed, under the guidance of the head of its public maintenance bureau, Rex Goodwin. Rich and powerful people live in what is now known as "New Domino City", while the poorer class are shunned and live mostly in the slums area, known as "Satellite". They are referred to in the Japanese version as "Satellite scum" (kuzu) by the inhabitants of New Domino City. (There is significantly less emphasis on class in the 4Kids adaptation.) An aspiring duelist from Satellite, Yusei Fudo, builds his own Duel Runner, but is betrayed by his best friend, Jack Atlas, who steals his Runner and his most precious monster, the Stardust Dragon. While Jack battles his way to the top and becomes Duel King, Yusei is forced to live on in Satellite with his friends.
The Crimson Dragon, as seen during Yusei and Jack's Turbo Duel.
Two years later, Yusei has built another Duel Runner, and sets out to win back his Dragon and regain the bonds he once had with his friend. Jack, now known as the King of the Riding Duel, has made a name for himself and his monster, the Red Dragon Archfiend (Red Daemon's Dragon in the Japanese version), in New Domino City. Yusei and Jack face each other in a Turbo Duel, and during the duel Yusei is able to regain control of Stardust Dragon. As Stardust and Red Dragon Archfiend battle, a third dragon appears and brings an abrupt end to the fight. This attracts the attention of Rex Goodwin, who reveals to Jack an ancient secret - thousands of years ago, the "People of the Stars" (星の民, Hoshi no Tami?), a pre-Incan civilization, were attacked by evil monsters, and summoned a mighty beast known as the "Crimson Dragon" to protect themselves. The Crimson Dragon imprisoned the evil forces into the ground, forming what are now the Nazca Lines. Goodwin reveals to Jack that five descendants of the People of the Stars are still alive in the present day, and have the power to call the Crimson Dragon once again, in order to guard against the return of evil. These five "Signers" (シグナー, Shigunā?) may be recognized by the "Dragon Marks" they bear, a symbol on their body representing a part of the Crimson Dragon. The Marks react and begin glowing when their owner or another Signer is dueling. There are five Marks, the Dragon's head, tail, wings, and two claws. Jack has carried the wings since birth, and the tail originally appeared on Yusei's arm during the battle between Stardust Dragon and Red Dragon Archfiend. After the duel ended, the Mark vanished, but it often reappears when Yusei is around other active Signers. Yusei's Stardust Dragon and Jack's Red Dragon Archfiend are the first two dragons. The third dragon is the Black Rose Dragon and is possessed by "Black Rose Witch", Akiza, the third signer and a girl who possesses psychic abilities. She believes her Dragon Mark to be the cause of her strange powers. The fourth dragon, Ancient Fairy Dragon, is held by Luna whilst her twin brother Leo thinks his Power Tool Dragon is the fifth.
Goodwin has started a dueling tournament, the Fortune Cup, in order to locate the remaining Signers. Yusei and his friend Luna have both been invited, as has the mysterious Black Rose Witch. The winner of the tournament will be given the honor of facing off against the Duel King, Jack. During the tournament, Luna is confirmed as being the fourth Signer and Goodwin's severed hand holds the final birthmark, calling forth the Crimson Dragon again in the final match between Yusei and Jack, in which past and future events are shown before them. Yusei wins and becomes the new Duel King, but soon encounters a new enemy. This mysterious group known as the Dark Signers can perform Shadow Duels using Dark Tuner and Dark Synchro monsters and can possess others to do the same. They begin abducting Satellite citizens and attacking the other Signers. In order to defeat them, the Signers unite together.