Brenton Thwaites as Chris

Theo Rossi as Kirk

Skylar Astin as Eugene

Kyle Gallner as Tappert

Alan Ritchson as Butchie

Billy Zane as Dr. Engel

Shaun Toub as Mr. Helwig

Matthew Reese as Sergeant Elks

Laila Banki as Mrs. Helwig

Shannon McKain as Lieutenant Morgan

Nathan Cooper as Private #1

Alexander Behrang Keshtkar as Leader

Yanitsa Mihailova as Christina

Rebecca Flinn-White as

Kaloyan Hristov as Helwig Boy

Amber Townsend as Camp Victim

Alexandra Spasova as Famished Mother