A young man named Rikku dreams of joining in the Bakugan Battles despite not owning a single Bakugan of his own. One day, his dream comes true. Rikku gets his first taste of what a battle is like when his friend Dan lends him Drago, a Bakugan with immense arena experience. Completely swept up in the intensity of the Bakugan Battles after his first taste, it is with a heavy heart that Rikku returns Drago to Dan. However, on his way home after the most exciting day of his life, Rikku comes across a never-before-seen Bakugan named Leonidas. Leonidas confides to Rikku that he has mysteriously found himself in this unfamiliar world, and agrees to stay with Rikku for a while until he can sort things out. Now armed with his own unique Bakugan, Rikku is ready to enter his first tournament and change both Leonidas’ and his own life forever.