The boys sing Let Me Save You With My Love while Kara attempts to attack them repeatedly as the rest of the Super Hero Girls try to stop her. However, it turns out that the boys on stage are Hal, Barry and Garth dressed in the white Up Past 8 clothes, while Bumblebee ties up the three actual band members backstage in their undergarments. Later, the concert is about to begin, and as the lights turn on with the silhouettes of what appears to be the members of Up Past 8 appearing, Ra's forces Kara to transform into an evil version of Supergirl through their pieces of red kryptonite to destroy the band. Bumblebee decides that in order to stop Ra's and his plans, she must call for help. Bumblebee uses her wrist computer to analyze the Demon's Fang, revealing that it is of Kryptonian origin, and that red kryptonite causes, among other things, "susceptibility to mind control" in Kryptonians. She spots Ra's with the rest of the LOS and hears him telling his acolytes that he controls his new weapon with "a stone from outer space", and plans to control Kara to destroy several atrocities, the first being bad pop music. Karen transforms into Bumblebee, and goes miniature to sneak into the concert. She follows Kara and sees her using the tickets to get into the Up Past 8 concert. Karen notices her tickets for the Up Past 8 concert are missing and suspects Kara took them. She disrupts all the other girls' and boys' activities, acting incredibly rude and then flies away. Kara arrives shortly after with red irises and wearing the Demon's Fang on a choker. Karen returns to the secret base and throws away her makeover clothes, returning to her old self. Later, on stage, Ra's sings Kara a song, and the lyrics allow the Fang to possess Kara's soul and make her an evil servant for Ra's.
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Ra's gives Kara the "Demon's Fang", a red, glowing guitar pick. At the show, Karen continues to feel uncomfortable about the atmosphere, and Kara is invited backstage where she meets Ra's Al Ghul and the other band members of League of Shadows. When nobody wants to go to either of their concerts, Kara decides to take Karen to the League of Shadows live show, and gives her a punk-rock makeover, much to Karen's distaste. Karen also tells them about the band Up Past 8 and says she has tickets to their concert. Kara tells the Super Hero Girls and three of the Invinci-Bros, Hal, Barry and Garth, at the secret base about the band League of Shadows performing at the Lazarus Pit club.