S1 • E1
The Bakugan, Drago, who will soon become Dan's closest ally, begins to explain the origin of Bakugan and the Dimension of Vestroia.
S1 • E2
When Dan hears about this through his friends on the web, he decides to put an end to it and challenges Masquerade to a battle.
S1 • E3
Masquerade teams with a young Bakugan player named Rikimaru by offering him a very special Bakugan.
S1 • E4
Dan is having a hard time without Drago around. Feeling frustrated, he takes his anger out on a school friend name Ryo.
S1 • E5
Dan and Runo meet for the first time
S1 • E6
Dan and Runo are invited on stage to assist two brothers performing a magic act.
S1 • E7
Marucho reveals that he has secretly moved into Dan's neighbourhood
S1 • E8
Dan and Marucho are pitted against the two pop star princesses, 'Jenny and Jewls
S1 • E9
Masquerade convinces two boys into using the Doom card against the Bakugan Battle Brawlers.
S1 • E10
Julie and her childhood friend Billy go toe-to-toe in a Bakugan Battle.
S1 • E11
Marucho and Runo realize that the combined strength of the Battle Brawlers doesn't match up to Masquerade's power.
S1 • E12
Alice realizes that she may have a connection to the mysterious Hal-G
S1 • E13
Masquerade has been destroying kids' Bakugans all over the world and the Brawlers need to put a stop to it.
S1 • E14
Bakugan players gather at a mysterious mansion.
S1 • E15
The Brawlers head off to Bakugan Valley looking for the 'Infinity Core'.
S1 • E16
Shun becomes convinced that someone is spying on them.
S1 • E17
. The battle is intense and results in Preyus being sent to the Doom Dimension!
S1 • E18
The Brawlers learn the origin of Wiseman. In what seems like their darkest hour, Gunz appears at the worst time, taking on the mantle of Wiseman and leading the Nonets.
S1 • E19
Julie finds herself in a brawl with her childhood friend Billy in order to save him from Masquerade.
S1 • E20
Dan and Shun have a falling out and Shun takes off on his own to seek out and destroy Masquerade.
S1 • E21
The Brawlers are ambushed by three of Masquerade's gang.
S1 • E22
Marucho almost loses his Bakugan Preyas to the Doom Dimension again!
S1 • E23
The Brawlers have reason to suspect the webmaster by the name of Joe is spying on them.
S1 • E24
Alice befriends a young Bakugan player named Christopher. He loves his Bakugan but is always losing and is on the verge of throwing his Bakugan away. Alice convinces him that battling is more than just skill and power; it's about confidence. In a fierce brawl against a seasoned Bakugan player, Christopher takes Alice's advice and tastes victory for the first time!
S1 • E25
Runo suspects Alice is secretly spying on the Brawlers and giving information to Masquerade.
S1 • E26
Mechtavius Destroyer wreaks havoc in Bakugan City. The Brawlers, still trapped in the Doom Dimension; battle Gunz and Betadron.
S1 • E27
Webmaster Joe informs the brawlers that Masquerade has systematically discarded his henchmen and their Bakugan and that Hydra has likely evolved, becoming even more powerful! Dan finally faces off with Masquerade in a deadly battle where Drago is sent to the Doom Dimension! Dan is overcome with grief and follows Drago. Will we ever see Dan again?
S1 • E28
When Zenoheld declares that he is going to use Clay's "Alternative" Weapons System to destroy Earth and Vestal, Volt decides that he's had enough. Unable to support the destruction of innocents he leaves the Vexos and returns to his home town on Vestal. He is soon ambushed by Hydron, who has been dispatched by Zenoheld to make Volt pay for his "betrayal". The two battle it out with Volt emerging victorious.
S1 • E29
In the Doom Dimension, the Brawlers desperately search for Dan and Drago. There, they meet the legendary Six Soldiers of Vestroia. These ancient soldiers once saved Vestroia from total destruction many millenniums ago. They want to help the Brawlers save Vestroia again, but first set out a series of tests that the group must pass to prove they are worthy. Julie is the first to be tested... will she have what it takes?
S1 • E31
This time it's Shun and Skyress who are put to the test in the Doom Dimension. Shun is approached by a mysterious little girl who seems harmless, but then pulls out a powerful Bakugan. Realizing that this is his test, Shun and Skyress battle fiercely with the strange girl. Skyress meets an explosive end, but Shuns' grief brings her back to life in an evolved form as Storm Skyress. Together they finish the battle and pass their test. But what of the future of Earth and Vestroia? Is it too late?
S1 • E32
Runo and Tigrerra are put to the test in the Doom Dimension. They find themselves battling a younger version of Dan! Runo rises to the challenge but doesn't listen to Tigrerra and rushes into action, quickly losing two rounds. Just when Runo realizes that her stubbornness has put Tigrerra and herself in great danger; Tigrerra evolves into Blade Tigrerra! Can the evolved Blade Tigrerra defeat Young Dan?"
S1 • E33
S1 • E35
Dan tells Shun, Julie, and Marucho that he has yet to pass the test in the Doom Dimension and the only way to have Drago evolve he has to defeat his friends one by one. Julie first battles Dan and Dan wins. Then, he battles Marucho and wins again. Shun says he will battle Dan the next morning. Masquerade is in the Doom Dimension and is about to start a battle with Alice.
S1 • E36
Dan's final test is to beat his friends so his Dragonoid can evolve to the next level and become the Ultimate Bakugan. Dan battles Runo and Shun while Masquerade goes to see the Darkus Lord, Exeedra, and he ends up fighting Alice as a mirage.
S1 • E37
Joe shows up after Dan defeats Julie, Marucho, and Runo for Wyvern to check out Drago's battling skills when Dan and Shun have their battle to finish Dan's test. Meanwhile, the Darkus Lord and Masquerade finish their battle. In the end Drago beats Skyress and becomes the Pyrus Ultimate Dragonoid, and Duel Hydranoid beats the Darkus Lord and evolves into the Darkus Alpha Hydranoid.
S1 • E38
Alice appears to be disappearing all the time. Dan goes to talk with Marucho, Runo, Shun, and Julie and ends up finding Alice. Alice won't explain anything and leaves. Later, Joe receives a message from Masquerade, and Dan decides he'll take over to fight Masquerade with Drago to end it once and for all with Masquerade. Dan wins and offers Masquerade to join the Battle Brawlers to help defeat Naga. But Masquerade refuses and takes off his mask. It is revealed that Alice was Masquerade the whole time.
S1 • E42
S1 • E43
S1 • E46
Wavern puts an energy shield around Wardington powered by the Infinity Core to protect Naga and his troops. Meanwhile, the Brawlers return and join the battle to protect Earth and defeat Naga before the two cores can be united. If not, both worlds will be destroyed. Jenny, Jewels, and Marucho protect the city across the sea, where the Ventus/Aquos hybrid has created tsunamis.
S1 • E50
Dan and Runo present themselves as the only defense against Centorrior and Druman. As Dan recalls the battle with them, he realizes that they don't stand a chance without help. Julie, Billy, Marucho, Klaus, Julio, and Komba also participate in the battle, due to the transmission sent by Hal-G. Alice takes her grandfather to Joe, only to find that he had been tricked.
S1 • E51
Wavern calls Drago to tell him that she needs help, while the Brawlers must defeat Centorrior and Druman. Naga's negative energy is proving to be too much for Wavern and Fourtress. Wavern asks Drago to attack her so that she can give him the Infinity Core.
Drago
Runo
Volt
Preyas
Takashi
Gus Grav
Gus Grav
Billy
Baron
Dan