Movie: I am Number Four

The story starts with the number three, who being chased by group of Mogadorians, and he very soon killed by them in the midnight. Movie centers on the number four, who a teenage alien named John along with his guardian, named Henri. Both of them travel across the country escape from capture by enemies. Meanwhile John tries to have a normal life and he meet a girl named Sarah. The climax part starts with John's unexpectedly extraordinary power activate which lead to the detection of Mogadorians and they found him. This story came from a novel which has a proposed six-book series and DreamWorks Pictures bought the rights for film.