DreamWorks has released the trailer for D.J. Caruso's upcoming sci-fi action flick I Am Number Four.  The plot centers on nine aliens who escaped the destruction of their planet and landed on Earth, but are now on the run from those who destroyed their home world.  This trailer doesn't tell you that, but it does let you know the unfortunate fates of aliens Number One, Number Two, and Number Three.  Alex Pettyfer plays Number Four and is living disguised as a teenager.  The film also stars Teresa Palmer, Dianna Agron, Kevin Durand, and Timothy Olyphant.

Hit the jump to check out the trailer.  I Am Number Four opens February 18, 2011.

Click over to Yahoo! Movies to see the trailer in HD.

Here's the official synopsis for I Am Number Four:

An extraordinary young man, John Smith, 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, John is always the new kid with no ties to his past. In the small Ohio town he now calls home, John encounters unexpected, life-changing events -- his first love, powerful new abilities and a connection to the others who share his incredible destiny.

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