Bakugan Battle Brawlers begins with Danma Kuusou, a boy who invented the game Bakugan with his friend Shun Kazami after mysterious and seemingly random cards fell out of the sky. Together with their other friends, they form a team called the "Bakugan Battle Brawlers" in order to play this new game together. But unknown to these young friends, Bakugan is much more than a simple past time. Their game accidently sucks them into an alternate dimension called Vestroia, the home ground of Bakugan.

Vestroia has recently come under attack by creatures known as the Doom Beings. This realm is balanced by the Perfect Core, which itself is formed by the Infinity and Silent Cores. When the evil Bakugan Naga attempted to take this great power for himself, he was unable to absorb the negative energy he wished to steal and found himself trapped in the Silent Core. Now, his presence within the core has destabilized Vestroia and attempts to merge with Earth as well as many other worlds. Danma and his friends must team up with individuals from other worlds who have also been drawn into this epic battle. As Naga is seeking the Infinity Core so that he may complete the Perfect Core in order to gain control of Vestroia, Earth, and all other worlds, time is of the essence in this devastating war of worlds.

The story follow Dan, Marucho and Drago as they join forces with the Bakugan Resistance in order to restore peace and freedom to their enslaved planet. The newly formed group of friends must battle the evil Vestal to free the captured Bakugan and destroy the Vestal’s plans for domination.

[Source: animationmagazine.net]

The strength of the Bakugan Battle Brawlers? is shaken to the core with the threat of losing dan's leadership! And A new insidious enemy infultrated Bakugan Interspace shattering the loyalties of the brawlers and their ardent fans.

[Source: MyAnimeList]

Dan, Marucho, and Shun get caught up in a war between two different alien factions in another universe, and teaming up with three new brawlers: the Neathian, Fabia, the new human, Jake, and the Gundalian, Ren, in order to stop the evil Gundalian Protectors, the Twelve Orders from destroying Neathia, and possibly, Earth. They meet these people by them entering through the virtual reality Bakugan Interspace. The stakes are high! Will the Battle Brawlers triumph, saving the Bakugan once more?

[Source: Bakugan Wikia]

Bakugan is the card game for a new generation. In "Baku TECH" passionate warriors fight each other and risk their life for Bakugan.

When Bakugan began emerging from the earth's crust in a mysterious worldwide "awakening," Dan and his friends find themselves at the epicenter of a new age. Dan and Company quickly learn that they must grow into more than just suburban kids looking for quick fame in the post-Bakugan era. They must learn how to work with their Bakugan and deploy them in battle in order to survive the seemingly endless forces out to control, enslave or just plain destroy the mysterious race of alien creatures. Dan and his friends will evolve into bona fide heroes by protecting their Bakugan, the Earth and ultimately the incredible secret hidden beneath our feet: Our planet has merged with another, living planet... Vestroia!

[Source: Spin Master]

When Bakugan began emerging from the earth's crust in a mysterious worldwide "awakening," Dan and his friends find themselves at the epicenter of a new age. Dan and Company quickly learn that they must grow into more than just suburban kids looking for quick fame in the post-Bakugan era. They must learn how to work with their Bakugan and deploy them in battle in order to survive the seemingly endless forces out to control, enslave or just plain destroy the mysterious race of alien creatures. Dan and his friends will evolve into bona fide heroes by protecting their Bakugan, the Earth and ultimately the incredible secrethidden beneath our feet: Our planet has merged with another, living planet... Vestroia!

[Source: Spin Master]

Bakugan: Geogan Rising sees hero Dragonoid return as the Awesome Brawlers remain in a deep slumber, healing from the last time they had to save the world. This time, the gang will face adventures with a new set of Bakugan characters including Geogan, a Bakugan-like creature fused with elements of crystals and forming a new geometric form. Not only do Geogans look different than their Bakugan counterparts, but they are exceptionally strong and built to brawl. It's not long before the Awesome Brawlers turn this group of misfit Bakugan into loyal partners, and Geogan have arrived on the scene, ready to prove their worth and dominate in the Bakugan battle arena.

[Source: Spin Master via ToyNews]

The Awesome Brawlers realize that the connection between Earth and Vestroia is on the verge of disappearing, bringing a new threat to the surface!

[Source: Netflix]

In the exciting new season of Bakugan, the VESTROIAN galaxy is made up of six planets each home to a different species of Bakugan (Avian, Dragon, Insect, Beast, Aquatic and Dinosaur). Constantly at WAR with one another, the use of experimental weaponry causes the Bakugan to be inadvertently transported to EARTH. Baku-balls rain down from the sky like meteors and crash into cities, forests, and oceans. And when the balls unroll, humans meet the 10 FEET TALL Bakugan for the very first time. Thankfully, humanity welcomes these displaced creatures, embraces their culture, and particularly falls in love with their long-standing tradition of BRAWLING. That is until teenagers start PAIRING with Bakugan and miraculously give them the ability to grow to giant KAIJU size! The world was filled with fear, and it was during this time THE CATASTROPHE happened.

[Source: Spin Master]