Jason Gedrick and a small group of Marines are stranded in the remote Afghan desert. But it ain't the Taliban that's worrying them, it's these giant refugees from Tremors. In fact the big worms prove to be an ally of sorts by doing better against the Taliban than themselves but battling these enemies is something not covered in their training.

Paranoid computer programmer Simon wakes up to find a package in his room one day. Despite attempts at securing his apartment, the packages keep arriving. While cameras watch Simon's every move, he struggles to find the answers to the mysterious forces taking over his life.