Movie opens on a normal high school with normal students where nothing out of the ordinary happens. Everything changes one night when a UFO lands in the middle of an open field with no one around to see it. On board of this UFO is one alien who is adamant about taking over Earth. He makes a plan that try and possess the mayor of the town and start there, but that is proving to be a little more difficult than he anticipated. While attempting to possess the mayor, the alien sees a picture of his daughter and thinks that she will be an easier target. He is right. He successfully possesses the mayor's daughter Sarah hoping that this will be the first step in taking over the world. That is until he has to go to school the next day. He ends up going through all the trials and tribulations of being a teenage girl. He deals with homework, boys, friends, sports and PUBERTY. He takes control of her body for 6 months. In this time period, Sarah's best friend, Katie becomes suspicious and ...