I Am Number Four— Full Cast

Alex Pettyfer

as John Smith / Number Four

Dianna Agron

as Sarah Hart

Teresa Palmer

as Number Six / Maren Elizabeth

Timothy Olyphant

as Henri Smith

Kevin Durand

as Mogadorian Commander

Callan McAuliffe

as Sam Goode

Jake Abel

as Mark James

Garrett M. Brown

as Mr. Simms

Patrick Sebes

as Kevin

Emily Wickersham

as Nicole

Jeff Hochendoner

as Sherriff James

Greg Townley

as Number 3

Reuben Langdon

as Number 3's Guardian

Molly McGinnis

as Receptionist

Brian Howe

as Frank