Bakugan Battle Brawlers - No Guts No Glory - Season 1 Episode 16
While the Bakugan Battle Brawlers desperately try to search for the Infinity Core in Bakugan Valley, they can't help but feel sorry for their teammate, Julie. She discovered that her childhood friend Billy had joined up with Masquerade and the news devastates her. However, Shun has other things on his mind. He believes that someone close to the Brawlers may be a spy and they are feeding information to Masquerade.