Kodi Smit-McPhee as Owen

Chloë Grace Moretz as Abby

Richard Jenkins as The Father

Elias Koteas as The Policeman

Sasha Barrese as Virginia

Dylan Kenin as Larry

Dylan Minnette as Kenny

Jimmy 'Jax' Pinchak as Mark

Nicolai Dorian as Donald

Seth Adkins as High School Kid

Ritchie Coster as Mr. Zoric

Cara Buono as Owen's Mother

Chris Browning as Jack

Rebekah Wiggins as Nurse

Ashton Moio as Lanky Kid

Gwendolyn Apple as Girl in Pool

Brett DelBuono as Kenny's Brother

Colin Moretz as Video Arcade Counterman

Rowbie Orsatti as Scottie Tate

Brenda Wehle as Principal

Galen Hutchison as Football Player #1

Dean Satriano as Football Player #2

Deborah L. Mazor as Day Nurse

Rachel Hroncich as Admitting Nurse

Braden Wilcox as Junior High Student (uncredited)