When Gustavo begins working with a female pop group called the Kat's Crew, the boys of Big Time Rush get some jealousy when their new single "I Know You Know" is taken by the Kat's Crew. They start a war between each side (Big Time Rush & Kat's Crew), believing that Gustavo will forget about them and cancel Big Time Rush. The guys turn to "Boys in the Attic", Gustavo's first boy band, for some advice: they were also destroyed by a female group named "Angel Angels". In the end Gustavo decides to keep the guys and stop working with the Kat's Crew, but before the girls leave Rocque Records forever, Big Time Rush makes a song and a video with them. Meanwhile, Katie and Mrs. Knight and are trying to find good friends (thetvdb.com)