Bakugan is the story of Dan and his friends as they battle their Bakugan monsters to save the parallel universe of Vestroia and ultimately the Earth from destruction. After losing a battle to her childhood friend, Julie desperately wishes for a talking Bakugan. When Marucho and Runo try and convince Shun to join the team, he challenges them to a brawl. Dan recalls the last battle that he had with Shun and discover why Shun decided to leave the game for good. Dan joins Runo and Marucho in another attempt to recruit Shun.