Blast From the Past.After Mechtavius Destroyer destroyed Bakugan City with his full powers, killing Runo, Julie, and Mira as well, he goes to New Vestroia to destroy all the Bakugan there, but his plan was interrupted by the Brawlers' bakugan from past seasons. They tried to defeat Mechtavius Destroyer, but they are defeated because of his strong power. Back in the Doom Dimension, Worton tells the Brawlers about the Current of Time, which he discovered by himself when he goes back into time and tells Balista to untell Wiseman the secrets about him in attempt to save his life. After, the Brawlers go into the Current of Time to get out of the Doom Dimension. As the current is about to get very strong, the Brawlers' memories were seen, including Betadron, who sees the fate of the Nonets when they were crushed by Mechtavius Destroyer. Also, the Brawlers have seen the destruction of Bakugan City and New Vestroia and see that Mechtavius Destroyer wiil also destroy Vestal, Gundalia and Neathia, meaning that Fabia, Nurzak, Ren, and all their other allies are next on Mechtavius Destroyer's hit list. After that, Worton and Betadron sacrificed themselves so that the Brawlers make it to face Mechtavius Destroyer for the final battle. Successfully getting out of the Doom Dimension, arriving before Mechtavius Destroyer could depart to destroy Bakugan City, the Brawlers told Mechtavius Destroyer that he will be defeated this time, and the final battle begins!