John Smith / Number Four
Sarah Hart
Number Six / Maren Elizabeth
Henri Smith
Mogadorian Commander
Sam Goode
Mark James
Mr. Simms
Kevin
Nicole
Sherriff James
Number 3
Number 3's Guardian
Receptionist
Frank
Bret
Girl on Street
Sam's Stepdad
Mr. Berhman
Physics Teacher
Sarah's Dad
Sarah's Mom
Sarah's Brother
Demented Farmer
Drew
Kern
Teen At Party
MOG Warrior
Tuck (uncredited)
Supermarket Cashier (uncredited)
Sheriff Deputy (uncredited)
News Reporter (uncredited)
Teen #1 (uncredited)
Neighbor (uncredited)