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The band-aid on Shouta Kirifuda's forehead -- used to suppress his uncontrollable power -- has peeled off. There seems no adverse effect at first. Suddenly, Shouta's pet hamster Hamkatsu starts talking, revealing a big secret.
23 years after the events of Future Card Buddyfight X, Yuga Mikado is son of Gao Mikado. Because Yuga is talented at games, he is known as the "Ace of Gaming." However, Buddyfight is Yuga's first card game. Yuga's Buddy is Gargantua Dragon, who is also known as Garga.
Bakugan Interspace has gone active all across the Earth, and kids are having fun testing their skills against Dan, Shun, and Marucho. However the Brawlers soon learn some Bakugan were sent into an alternate dimension when Vestroia became six different groups. These Bakugan are now at war with each other as the Gunadlians and the Neathians fighting for control of their dimension and looking to recruit the strongest Earthlings to their cause. When the battle spreads to Bakugan Interspace, the Brawlers must decide which side they will join and how they can keep other kids from falling into the politics of war.
Drago is unable to control the powers he has received from Code Eve, so Dan and Drago contemplate retirement. Meanwhile a new and insidious enemy infiltrates Bakugan Interspace shaking the Battle Brawlers and their fans. The Battle Brawlers must find a way to control Code Eve's powers, with the help of some new allies, or else this new threat could threaten all Bakugan everywhere.
Drago returns to Earth with a new ally named Mira. The five original Bakugan that helped restore order to New Vestroia have been captured, Drago is now being targeted, and a group of humans known as the Vexos are taking over New Vestroia. With the help of Dan and the Battle Brawlers though, Drago believes he will have enough power to not only free New Vestroia but his friends as well.
One day, a flood of magical cards rained down from the sky and were collected by unsuspecting children. Unaware of the great power of the cards, the children created an exciting new game called Bakugan Battle Brawlers - but once they began to play it, they discovered that the monsters were real! Now Daniel and Drago must try to save Vestroia, the home dimension of the monsters in their new game. To make matters worse, they also have to contend with the mysterious player known as Masquerade, who has been taking other players' Bakugan from them.
Twelve-year-old Shobu Kirifuda has one goal: to become a top-ranking player at the game of Duel Masters, a card game in which players use spells and summon monsters to break through their opponents' shield cards and subsequently defeat them. Shobu believes he's a great player, but he soon discovers that there is more to the game than he originally thought; true Duel Masters, he learns, are able to make the monsters on the cards manifest themselves during a duel. A mysterious group has taken a keen interest in Shobu, although their reasons are as mysterious as the group itself. Now Shobu and his friends not only have to win the championship, but also try to figure out who these people are and why they're so interested in Shobu.