Beta City Blues is the 20th episode of Bakugan: New Vestroia. It aired on September 19, 2009.
As Dan Kuso and Baron Leltoy safely make it back to New Vestroia, they find their base completely empty, and with no sign of Shun Kazami, Ace Grit or Marucho Marukura anywhere. They discover that they are near Beta City and resolve to head there believing that Shun, Ace and Marucho have gone there. Meanwhile, as Spectra Phantom makes his return, the other Vexos are shocked to see that Mira Clay is with him saying that she has joined the Vexos. However, in her mind, she only wants to find out what Spectra is really up to. Also, she discovers that three Brawlers have been captured and are being held hostage and she tries to release them. Dan and Baron sneak into Beta City and battle Mylene Farrow and Shadow Prove. Meanwhile, Mira Clay is interrupted by Spectra Phantom who helps her release her friends, but he tells her that she owes him a debt. As the battle wages on, Leltoy is defeated defending Drago, who taps into the power of the Perfect Core, defeating Mylene Farrow and Shadow Prove easily as well as destroying the dimension controller. Ace Grit, Shun Kazami and Marucho Marukura reunite with Beta City, Baron and they make their leave from Beta City. Later, Mylene Farrow accuses Spectra of her loss and the escape of the prisoners, but Gus Grav reminds her that she lost the battle, not him. Mira Clay is still left with wondering what Spectra Phantom is up to.