En route to the first stop of the Big Time Rush "All Over The World Tour", Carlos has a dream in which he is a spy, and the group rescues a princess. At the airport, an M16 agent pursued by British agents switches Kendall's backpack with his identical one, which is revealed to contain an evil gravitational device. The boys team up with the kidnapped MI6 agent's daughter, Penny Lane, and promise to help save her father. Their tour director wants to cancel the tour, while Gustavo and Kelly try to save it, but secret agents tell them that BTR want to take over the world. The boys meet with the villain, Atticus Moon, and escape with Penny's father and the backpack. Moon's spies kidnap Katie, and the boys drive Penny's spy-van into Moon's castle to rescue her and defeat Moon. The British government then helps BTR save their world tour. As the movie ends, the boys leave with Penny and father in the spy-van.