Bakugan Battle Brawlers

Dan and his family have relocated to the city of Bayview after his father receives a work transfer. Dan quickly befriends his classmate Jake and one afternoon they decide to pay a visit to Bakugan Interspace. Now a worldwide gaming phenomena, Marucho's dream creation B.I. is where kids from around the world go to do virtual battle. Once inside, Dan and Jake meet up with Marucho and Ren (the mysterious stranger seen at the end of "Final Fury"). Ren manipulates the data, which leads to a battle between he and Dan. When both Brawlers pull out the Battle Gear and explosion occurs which leaves Dan unconscious and forces Marucho to engage emergency shutdown measures. While knocked-out, Dan has horrible visions of an alien world where Bakugan are at war with each other. When he finally regains consciousness, everyone dismisses his visions as hallucinations. Everyone except Ren, that is. Is it possible that the Brawlers' new ally may be hiding something? And do his dishonest manipulation of the battle order suggest that he has an ulterior motive? Only time will tell...

Dan continues to be haunted by the visions he saw while unconscious after an explosion during battle. Meanwhile Marucho notices that Ren is also behaving strangely. When he presses him on his odd behaviour, Ren reveals that he is in fact an alien from the planet Gundalia and that he has come to Earth to enlist the Brawlers' help. His home is under attack by the vicious Neathia tribe who area using their Bakugan as weapons of war. What's worse is that he claims that undercover Neathian agents have infiltrated Bakugan Interspace. Outraged, the Brawlers agree to help Ren and immediately go after two of the Neathian agents. A thrilling battle ensues, but questions still remain. Who exactly are these Neathians and is Ren being truthful about his own motives?

The other Brawlers get together with Ren, who reveals the identities of more of the Neathian sleeper agents. Meanwhile, a tardy Dan who has slept in, races to get to the meeting. On the way, he crosses paths with a mysterious girl named Fabia who literally sends him head over heels. The gang soon learns that Fabia is in fact a Neathian herself. Convinced she's there to draft the Brawlers into fighting for her side, Dan challenges her to a battle. As their fight rages on, Shun grows suspicious about Ren and begins to wonder if perhaps the Neathians aren't the enemies they've been portrayed to be.

Dan is in the midst of training Jake in the battle arena with hopes that he will soon be skilled enough to become a member of the Battle Brawlers. An urgent message comes through from Marucho stating that another Neathian sleeper agent had been detected. The Brawlers race to the scene where the come face to face with the culprit: Mason Brown. Jake convinces Dan to let him battle Mason, but the Brawler in training's cockiness gets the best of him. He is soundly trounced by the Neathian, which shatters his confidence and threatens his future as a Brawler. With Dan feeling tremendous guilt over pushing Jake into the deep end, Julie steps in to offer guidance. The question is: will she be able to bring Jake back from the brink and prepare him for a re-match with the mighty Mason?

With the Neathian moles making themselves known, they begin kidnapping brawlers from Bakugan Interspace. The puzzling part is that each brawler is eventually returned to BI. Meanwhile, Sid and Zenet find their recruiting hard when Marucho puts out an announcement to everyone not to battle Sid, Lena, Mason, Jesse and Zenet. In retaliation, Sid and Zenet challenge Dan and Ren to a battle. Ren is quickly taken out but Dan makes an easy comeback, eliminating both Zenet and Sid. In the second battle, Linehalt takes a hit for Drago, putting Ren out of the battle while leaving Dan and Drago on their own. Being outnumbered, Dan loses but gets to keep Drago. After the battle, Gill orders Sid to not engage the brawlers and to leave it to Ren, who states their plan is working perfectly.

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 race back to Earth and discover the Chaos Bakugan are destroying Bakugan Interspace. Anubias and Sellon reveal they are working with Mag Mel. The Brawlers are trapped in interspace and must find a way to escape!

When the Brawlers discover that the Gundalians are inside Bakugan Interspace "recruiting"/kidnapping more battlers to join their cause, they race to the scene to confront them. Soon two separate battles break out and Ren flees in the confusion. While the Brawlers fight bravely to protect the other Battlers from falling victim to the Gundalian invaders, Ren is elsewhere hatching an even more sinister plot; one that will see the Gundalians seizing control of Bakugan Interspace and ejecting the Brawlers forever.

Now that Ren has taken over control of Bakugan Interspace, the Brawlers discover that they can no longer enter the virtual realm via the usual access points. Worried that more kids will fall victim to Ren's hypnosis, Jake smashes a control panel making it impossible for anyone to enter. Concerned for the safety of those already inside, Dan and Jake go on a recon mission with the help of Coredem who can "body-shift" them into Interspace. Once they arrive, Dan and Jake immediately square off with a pair of hypnotized brothers. As their battle wages on, they face the terrifying realization that Ren's recruitment and brainwashing of human children may be too far along for them to stop it.

With Ren and the Gundalians now in control of Bakugan Interspace, Marucho determines that the security system preventing the Brawlers from diving in is being run out of the secure "Baku-Room". He hatches a plan to infiltrate the stronghold so he can reboot the system and allow the Brawlers access once again. With the aid of Fabia and a digital Avatar of himself, he sets his plan in motion but it isn't long before trouble arrives. While Fabia and the Avatar fend off an attack from Lena and Zenet, Marucho runs into Ren, who has ideas of his own about who rightfully owns Bakugan Interspace. As the battles rage on, it becomes apparent that Ren may not be as loyal to Emperor Barodius as he once seemed.

When the invading Gundalians breakthrough the outer shield, Neathian Castle Guard Linus flees to Earth in search of Fabia. With him he is carrying "The Element" a mysterious and powerful item that the Gundalians need to get their hands on in order to rule the galaxy. Once he reaches Bakugan Interspace he meets up with Shun who has been busy trying to evacuate the kids trapped inside to safety. Just as Shun agrees to take Linus to see Fabia they are ambushed by Ren and Jesse and forced into battle. The action is intense from the start as the stakes have never been higher. No one knows this better than Linus, who stands to lose the one Element that can shift the balance of power in the universe.

In an attempt to get Neo Zipzam back before the Gundalians realize he possesses the Element, the Brawlers infiltrate Bakugan Interspace and walk into the middle of a Gundalian power struggle. Angry at Ren's "teacher's pet" status, Sid has hijacked Neo, threatening to take credit for his capture with the Emperor. Now face to face with the Battle Brawlers, Sid challenges Dan to a battle but at the last minute pulls a switch and fights with Rubanoid rather than Neo. As the battle begins, Dan and Drago struggle to figure out a way to win Neo back before they lose him forever.

Given a brief pardon by Barodius after his earlier failure, Ren hatches a plot with Zenet to regain possession of the Element. With deception as their key ingredient, Zenet disguises herself as Julie and attempts to trick Dan into handing over Drago (and the Element he contains within). The ruse almost works until the real Julie shows up and things quickly go from strange to insane.