Six people participate in a simulated voyage to planet Antheon, while an entity watches them.
"You are tropers who still believe in monsters!"
- Dramatis Personae: Done at the end of the episode, as each member of the main cast gets a credit.
- The Film of the Book: Like "The Invisible Enemy", this episode was based on a short story by Jerry Sohl. Unlike "The Invisible Enemy", Sohl did not work on the script, so this adaptation is even looser than the previous one.
- Humans Are Flawed: And the alien uses those flaws to pit the passengers against each other.
- In Your Nature to Destroy Yourselves: Referenced in the confrontation between the alien and the humans.Keith Ellis: We're a simple people. Given a chance, we'll destroy ourselves. Why do it for us?Antheon alien: Because you'll destroy us, too, if we let you. You do not know us, we have never hurt you, yet you come to attack, to conquer. We will not allow this.
- Jerkass: Joe Dix is an ill-tempered loudmouth who's motivated by Greed.
- One-Word Title: Also a Non-Appearing Title, since (unlike the source material) it's not mentioned within the story itself.
- Stop Motion: Used to animate the plant monster as it feeds on another plant, then crawls toward the passengers. It was The Outer Limits' first use of the technique since "The Zanti Misfits".