Doom Dimension Or Bust.The episode begins with the flashes of light indicating that a battle has just ended and Julio falls to the ground completely after he lost Tentaclear to the Doom Dimension beaten up from his battle against Masquerade who is seen walking away. Then it shows Runo who is worrying about the small amount of bakugan she has left. It then switches over to Chan who engages Masquerade in a battle, the battle ends badly however as Chan loses and Foretress is sent to the Doom Dimension. It switches back to Runo's cafe where Runo has just finished telling the brawlers that she isn't going to battle ever again with Tigrerra asking her later on if that is a good idea. It then switches over to Komba who is in the middle of a battle against Masquerade, Komba loses and Harpus is sent to the Doom Dimension. Later Masquerade challenges Billy and wins sending Cycloid to the Doom Dimension, Julie senses something is wrong when Billy's toy horse suddenly falls over. Meanwhile Runo contemplates her decision to quit bakugan when Dan and Drago show up trying to cheer her up, also saying that they'll cover for her and Tigrerra if she's serious. Meanwhile during his battle with Klaus Masquerade's Hydranoid evolves to Darkus Dual Hydranoid, this Hydranoid now has two heads and even more power than the old Hydranoid. Although Sirenoid plans to sacrifice herself using the Mind Ghost gate card to stop Masquerade's newly evolved Hydranoid. The plan fails and Klaus loses Sirenoid to the Doom Dimension. In the end, Runo decides to start playing Bakugan again as a Haos fighter.