Yugi and the gang have saved the world from Dartz and his Grand Dragon Leviathan, but they’re about to face their biggest challenge yet – How will they get home when they have no money?! Fortunately, Kaiba has a plan... but there’s a catch! It’s time for the KC Grand Championship!

Yugi is trapped inside the Duel Dome, and the only way to escape is by defeating the Duel Computer – a calculating contraption programmed with the skills of the world’s top duelists! Since the Duel Computer has access to thousands of cards to create a devastating deck, how can Yugi win when he’s forced to use an amateur deck that barely contains any spell or trap cards?

It’s the start of the KC Grand Championship! Sixteen of the world’s greatest duelists are all vying for a chance to challenge Yugi as the King of Games! There’s no time for Jonouchi to revel in the festivities, for he’s in the first match against the not-so-mysterious masked duelist Mask the Rock! But when Jonouchi forgets that it’s time to duel, if he doesn’t reach the duel arena in time, he’s disqualified! Will Jonouchi’s bonehead move cost him the tournament before he even draws his first card?

Mysteries abound! How does Mask the Rock know all of Jonouchi’s strategies? How can Jonouchi stop the masked master when he gathers his ancient cards to unleash the fiercest monster from the great past? But the biggest mystery is: How can Jonouchi not know who Mask the Rock is?

It’s the second match of the KC Grand Championship as Rebecca faces the kung-fu kicking Asia champion Vivian Wong! However, there’s more at stake than just winning the duel – Yugi’s heart is on the line, whether he likes it or not! At the other end of Kaiba Land, a couple of familiar former champions sneak into the tournament, only to find themselves facing a threat that sends shockwaves throughout all the competitors!

The first round is over, leaving eight duelists to compete for the right to face Yugi for the KC Grand Championship! Unfortunately for Jonouchi, his next opponent is Sieg Lloyd, the dashing duelist who defeated both Haga and Ryuzaki in one turn! Things may be bad for Jonouchi, but Kaiba has his hands full when all the rides in Kaiba Land go haywire! Can Kaiba find out who’s behind all the sabotages before the tournament is ruined?

Sieg activates Ride of the Valkyries, the same card that defeated both Haga and Ryuzaki at the same time! If that one card can defeat two duelists instantly, what chance does Jonouchi have all by himself? Jonouchi better have one last card to turn this duel around before Sieg’s Valkyries carry him off to Valhalla!

In the semifinals of the KC Grand Championship, it’s a duel between child prodigies as Rebecca faces Leon Wilson and his fairy tale faction! Rebecca is counting on Yugi to cheer and support her, but Yugi has bigger problems to ponder – Grandpa is missing!

Yugi finds Grandpa’s kidnapper, but is it really a kidnapping? The truth is painful – literally! While Yugi unravels the truth, Rebecca is starting to unravel when her dragons fall prey to Leon’s fervent fables! Rebecca must think of a new plan quick or there will be no happy ending!

It’s Sieg vs. Leon for the right to challenge Yugi in the KC Grand Championship Finals... but Kaiba stops the duel! Why would Kaiba interfere in his own tournament? The answers may lie in the very origins of KaibaCorp and the invention of the Duel Disk!

It’s a battle between Siegs’s Valkyries and Kaiba’s Blue-Eyes White Dragon! Siegs quickly gains the advantage by destroying Kaiba’s monsters before he can even draw them! With Siegs’s army growing in strength while Kaiba’s forces falter, Siegs is unstoppable!

It’s Yugi vs. Leon for the title of King of Games at the KC Grand Championship! However, something sinister lurks in the shadows, for this duel is more than just getting the crown! Sieg’s greatest revenge is about to commence as his real master plan is unleashed!

Leon is Sieg’s younger brother, and he’ll avenge his family’s loss! Leon’s fairy tales are giving Yugi nightmares, but the worst is yet to come because Leon has Sieg’s mysterious and special card. Sieg claims the card will take down KaibaCorp, but how can one card instantly destroy what Kaiba spent years building up?

Golden Castle of Stromberg is infecting the world’s Duel Disks with a virus that will destroy KaibaCorp! If Yugi doesn’t destroy the card, the virus program can’t be stopped – but Golden Castle of Stromberg can’t be destroyed by traps or spells! How can Yugi destroy a card that was engineered for ultimate survival and optimal destruction? KaibaCorp is on the edge of bankruptcy in the conclusion of the KC Grand Championship saga!