Dan Kuso's (Walker Scobell) whole life changed one day when strange playing cards started falling from of the sky and have spread everywhere around the world, with help from his friends they invent a new game by using small spherical creatures called Bakugan that once in battle they transform into powerful monsters when rolled onto special cards. Together they form a group calling themselves the Bakugan Battle Brawlers, with the arrival of Axel Miyagi (Alkaio Thiele) a billionaire brainchild and a rookie Pyrus Brawler who at first is struggling to learn the rules of the game and searching for the perfect Bakugan partner to be friends with, when all of a sudden he meets Leonidas (Keanu Reeves) a mysterious Bakugan who came to earth with no purpose and memory of who he was and where he came from, after a handful of battles the duo and the Battle Brawlers find themselves dragged into an all-out brawl fight for the fate of Vestroia (the Bakugan's home). Vestroia loses its natural balance and merges with the Earth known as The Great Collision. Dan and the brawlers have decided to bring back balance by meeting new friends and allies in the other worlds, learn more about the origin of the Bakugan; and facing Naga, a rogue bakugan who seeks the mighty Infinity Core so that he could complete the all-powerful Perfect Core and have almighty power and absolute control over Earth and Vestroia.