Alex Pettyfer character John Smith / Number Four
Dianna Agron character Sarah Hart
Teresa Palmer character Number Six / Maren Elizabeth
Timothy Olyphant character Henri Smith
Kevin Durand character Mogadorian Commander
Callan McAuliffe character Sam Goode
Jake Abel character Mark James
Garrett M. Brown character Mr. Simms
Patrick Sebes character Kevin
Emily Wickersham character Nicole
Jeff Hochendoner character Sherriff James
Greg Townley character Number 3
Reuben Langdon character Number 3's Guardian
Molly McGinnis character Receptionist
Brian Howe character Frank
Andy Owen character Bret
Sophia Anne Caruso character Girl on Street
Charles Carroll character Sam's Stepdad
L. Derek Leonidoff character Mr. Berhman
Sabrina de Matteo character Physics Teacher
Cooper Thornton character Sarah's Dad
Judith Hoag character Sarah's Mom
Jack Walz character Sarah's Brother
Bill Laing character Demented Farmer
Beau Mirchoff character Drew
Cody Johns character Kern
Isabella Robbins character Teen At Party
Damien Walters character MOG Warrior
Jon Braver character MOG Warrior
Kevin Cassidy character MOG Warrior
Matt Leonard character MOG Warrior
Nash Edgerton character MOG Warrior
Carrick O'Quinn character MOG Warrior
Tim Sitarz character MOG Warrior
Steve Upton character MOG Warrior
Tucker Albrizzi character Tuck (uncredited)
Megan Follows character Supermarket Cashier (uncredited)
Andre' Mason character Sheriff Deputy (uncredited)
Brenna Roth character News Reporter (uncredited)
Morgan Wolk character Teen #1 (uncredited)
