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.

After receiving mysterious empty packages inside his apartment, a young computer-programmer (named Simon) begins a personal investigation into their origins. This leads him to discover his odd and eccentric neighbors; an artificially intelligent robot-head, named Adam; a virtual-reality sex game; and a possible corporate conspiracy. As the story progresses, Simon's grip on reality becomes more and more tenuous, while his craving for Nature Fresh milk becomes almost unbearable. Is it all just in his mind, or is something more sinister happening here?

After being laid off in a downsizing of his company, the bitter and bigoted American accountant Terry Allen faces financial problems with the mortgage of his house. He uses his available time to snoop his downstairs neighbor Gabe Hassan, a Middle Eastern student that is having his Master degree sponsored by an Islamic organization in an American university, and calls the FBI to tell his suspicion. However, FBI Agent Tom Hilary asks him to forget Hassan. When Terry tells his wife Marla Allen that he had contacted FBI, she becomes upset and leaves Terry. However, his obsessive bigotry and alienation trigger paranoia against his neighbor and a tragic conclusion.