I Am Number Four

Nine infant aliens, who closely resemble humans, flee their home planet, Lorien, to hide on Earth. An invading species, the Mogadorians, have destroyed their planet, and followed them to Earth to hunt them down. Each of the nine aliens is given a guardian and will develop superhuman powers as they become adults. They are each assigned a number. These last children of Lorien can only be killed in the sequence of their numbers. Numbers One, Two, and Three have been killed so far. (official distributor synopsis)