Breakdown

Lockdown Is An American Horror-Slasher Film Starring Nico Tortorella, Danielle Panabaker, Julianna Guill, Ryan Merriman, Josh Hutcherson, Ashley Greene, Meagan Tandy, Cassie Ventura, Jean Luc-Bilodeau, Katrina Bowden,

Summary
Chris (Nico Tortorella) meets Heather (Danielle Panabaker), an outcast, and hangs out with her what he doesn't know is that Heather wants his friends and his girlfriend, Tracy (Julianna Guill), dead because she always hated popular kids but Chris and Tracy is always nice to her. Now its up to Chris, Tracy and the rest of the friends to stop Heather from killing them.