Alien and their Guardian are hiding on Earth from intergalactic bounty hunter. They can only be killed in numerical order, and Number Four is next on the list. This is his story.
Extraordinary teen John Smith (Pettyfer) is a fugitive on the run from ruthless enemies sent to destroy him. Changing his identity, moving from town to town with his guardian Henri (Olyphant), John is always the new kid with no ties to his past. In the small Ohio town he now calls home, John encounter unexpected, life-changing events-his firt love (Agron), powerful new abilities and a connection to the other who share his incredible destiny.

 "The key No. 4 "is the movie in the United States , and its original series ( 6 ) in the first story the protagonist is a 15 -year-old alien , information about it is their planet Lorien Mogadore star occupy because Mogadore Star have died , the people there specifically to plunder other planets resources in order to survive . 9 Lorien teenagers fled before the destruction of their own planet came to Earth and have super powers , when they were assimilated in the earth , and gradually adapt to high school , one of whom is aware of , destroying their planet the enemy to follow them also came to the Earth ...