Marucho and Ren finish an expansion for a new arena within Bakugan Interspace. Dan and Jake are excited, but before they can give it a test run, another Neathian agent shows up, Jessie Glenn. Dan is ready to battle Jessie, however, Shun and Fabia appear from out of no where, telling Dan that Jessie is lying to him about being a Neathian and that Fabia is a true Neathian. Fabia challenges Jessie, only to be defeated. Shun reveals to everyone that Ren is really the enemy.
Ren runs away, and so does Marucho after Shun's harsh words about Ren. The Brawlers arrive at Neathia and meet Fabia's sister Queen Serena. With her blessing, Fabia takes her new friends to see the Sacred Orb, a source of great power that is hidden deep inside a mountain. Before they can learn the Orb's true power, the Brawlers are summoned to the battlefront as the Gundalians break through the Neathian's second security shield.
With Barodius leading the enemy charge, the Brawlers are under intense pressure to keep the Sacred Orb and its power from falling into the hands of evil. With only one remaining security shield protecting Neathia from the invading Gundalian forces, the Brawlers hatch a plan to reinstate a previously destroyed shield. Marucho, Jake and Elright head for the frontlines to battle the lead invaders, and provide a distraction.
Meanwhile, Dan, Fabia and Shun travel through heavy jungle in search of the power source for the fallen shield so they can jump-start it. As Marucho and Jake get the Brawling action started, the question soon becomes: Can they keep the Gundalians occupied long enough for Dan and the others to find what. When the Brawlers are transported back to the Royal Palace, Ren is nowhere to be found. They learn that the Third Shield has been outfitted with a Bio-Filter that prevents anyone with Gundalian DNA from passing through.
When Dan asks Fabia to take the shield down and allow Ren to enter, she storms off in anger, revealing her deep-seated distrust of Ren. Serena reveals to the others that Fabia's fiance was a casualty in the war with Gundalia, which is why she cannot forgive anyone with Gundalian blood. Meanwhile, Fabia finds Ren and gives him one chance at redemption.
Ren and Fabia reunite with Shun and Marucho and regroup with Mason at Nurzak's secret lair. Meanwhile, Kazarina's experiments have succeeded and she is ready to splice Drago's DNA with Dharak's.
Bakugan Battle Brawlers Season 1
Bakugan Battle Brawlers Episode
This results in Dharak evolving into Phantom Dharak as well as his DNA no longer containing Gundalian DNA, allowing him to pass the third shield. In return, Barodius names Kazarina his second in command, demoting Gill in the process. Mason decides to go look for Nurzak, as there is a chance he survived while the others break into the castle to find Dan.