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