- The Control Voice: From the time we are children we are taught to mistrust strangers. But are we always as wary as we encourage them to be?
A teen becomes suspicious of his new neighbor when people start disappearing.
- The Control Voice: As long as an enemy is judged solely by his appearance, his victory is assured.
Something About Tropes:
- And the Adventure Continues: The ending as Zach has now joined the alien hunters as one of their agents.
- Area 51: Discussed. Zach Henniger sarcastically says that Nellis is just an Air Force base and explains that he is talking about Area 51 when his mother Nancy does not understand the reference.
- Disintegrator Ray: Harry Longworth and his partner Parker use an energy weapon on humans whose bodies have been occupied by the alien parasites. It turns the humans' bodies into green slime but leaves the parasites intact. The parasites are then placed in a special container.
- Good All Along: A teenager suspects that his mom's new tenant is an alien infiltrator when people start disappearing around town, whom the tenant is melting into green goo with a futuristic gun. The tenant was actually a U.S. government agent, and everyone he killed was one of the real aliens. The teenager's mother is the one who had really been replaced by the alien parasites.
- Government Agency of Fiction: The unnamed agency hunting the alien parasites.
- Kill and Replace: The reveal is that the mysterious tenant at a teenager's (played by Joseph Gordon-Levitt) house, who is going around killing people around town, is in fact a government agent who has been hunting these types of aliens. In a further reveal, it turns out that the boy's mother (who has been skeptical of the whole thing), not the agent, has in fact been impersonated by another one of these aliens.
- Puppeteer Parasite: The reptilian parasites who have taken over the bodies of numerous people in Hunterville and elsewhere have access to their hosts' memories, making it easy for them to impersonate the relevant humans.
- Who Shot JFK?: Discussed. When her son Zach is worried that their new boarder Harry Longworth may be a con artist or some other kind of criminal, Nancy Henniger jokes that he was the second shooter on the grassy knoll when he was five years old.