The guys, who desperately want to remain in L.A., ask Gustavo how the winning demo is picked, but Gustavo does not know. Mercedes Griffin, Griffins daughter, comes and pretends to be the "secret someone who picks the demos". Meanwhile, Mrs. Knight tries to be assistant manager to stay at Palmwoods for Katie's sake. Mercedes says that Kendall is her new boyfriend, which freaks Kendall out because he doesn't even know her. Kendall agrees to pretend to be her boyfriend so she will pick Big Time Rush as the winning band. However, she breaks up with him when he hesitates to say that he loves her. She then says Carlos is her new boyfriend and make him bake her cookies. The cookies are horrible and Mercedes throws them at Carlos, who runs to take refuge in the bathroom, where Gustavo, Kelly, Logan, James and Kendall are hiding. Mercedes breaks up with Carlos because he talked with "shower people" behind her back. She says Logan is her new boyfriend, but Kendall says that Logan is dumping her. She replies by saying that there is no way she will pick Big Time Rush and then smashes the Demo with her high heels. She comes back to apologize and admit that she is not the demo chooser. James is mad at her for never picking him to be her boyfriend, but soon feels better when she says that she never dates anyone prettier than her. The boys kidnap the real demo chooser, a chimp named Lolo, and they try to train him to like Big Time Rush with the positive reinforcement of bananas, but Lolo escapes. When Griffin stops by with the chimpanzee, he demands to know what happened. Mercedes tell him that it is her fault. They ask Lolo what he thinks of Big Time Rush, but Lolo says no. Mercedes says that Lolo is wrong and gives Griffin a lot of data to prove her point. Griffin is shocked and transfers Lolo to missile defense and make Mercedes the new demo picker and she picks Big Time Rush. Griffin asks Mercedes if there was anything he could get her, and she says she never got a chance to date Logan. Griffin makes Logan her new boyfriend. Afterwards Mrs. Knight quits being assistant manager when Kelly renews the lease. Gustavo writes a new song for the boys, "Halfway There", and the episode ends after they finish singing it. The boys get to continue living in L.A. and get to make an album for Big Time Rush.