I Am Number Four is a 2011 American science fiction action film directed by D. J. Caruso and starring Alex Pettyfer, Timothy Olyphant, Teresa Palmer, Dianna Agron, and Callan McAuliffe. The screenplay, by Alfred Gough, Miles Millar, and Marti Noxon, is based on the 2010 novel of the same name, one of the Lorien Legacies young adult science fiction novels. The film follows a teenage alien on Earth fleeing other aliens who are hunting him down.