Supergirl is an alien who escaped to Earth. 

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Movie Name:I Am Number Four (2011)
Summary:Aliens and their Guardians are hiding on Earth from intergalactic bounty hunters. They can only be killed in numerical order, and Number Four is next on the list. This is his story.
Director
D.J. Caruso
Writers
Alfred GoughMiles MillarMarti Noxon
Stars
Alex Pettyfer，Timothy Olyphant，Dianna Agron