Enterprise finds a Vulcan ship drifting in an asteroid field—and the crew has gone out of their minds.
Tropes in this episode include:
- Ankle Drag: Archer, though he's able to fight them off with kicks and phaser fire.
- Asteroid Thicket: A rather unusual example, as the asteroids are moving in ways that T'Pol describes as "chaotic"—possibly a result of the trellium in them, or spatial anomalies.
- Call-Back: The episode fills in the backstory of the Vaankara from "The Expanse". After the Seleya became trapped in Delphic Expanse, the Vaankara was assigned to find and rescue them.T'Pol: [to Archer] You already know what happened to that crew.
- Dead Man Walking: According to Phlox, it's too late to treat the Vulcans on the Seleya. They're barely able to help T'Pol.
- Ensign Crash: Trav's less-than-stellar landing on the asteroid, though Trip is far less critical.Travis: I hope you won't write that landing up in your log.
Trip: Are you kidding? I'm gonna recommend they give you a medal.
- Foreshadowing: T'Pol's trellium problems are only just beginning.
- I'll Kill You!: Crazy T'Pol.
- I'm a Doctor, Not a Placeholder: Inverted; T'Pol is scanning a Vulcan suffering from trellium poisoning, while she herself is clearly being affected.Archer: Any idea what's wrong with him?T'Pol: (tersely) I'm not a doctor.Archer: But you are my science officer. I need to know I can depend on you.
- In Medias Res: The Teaser shows Archer and Phlox bringing T'Pol to Sickbay while she's going completely bonkers. The episode then shows what led to that.
- Not Herself: T'Pol becomes affected, showing visible signs of fear and panic.
- O.O.C. Is Serious Business: You know it's serious when Archer and T'Pol are arguing and Archer is the logical one.Archer: We're here to save these people.
T'Pol: You're lying. You want to kill them!
Archer: If that's true, then why would I keep our weapons on "stun"? It's not logical.
- Our Zombies Are Different: Yeah, they're Vulcan zombies IN SPACE!
- Out-of-Genre Experience: On the audio commentary, director David Livingston remarked this episode was a fun shift switch from the typical fare to a horror movie.
- The Paranoiac: One of the early symptoms of T'Pol's trellium poisoning.
- Real Life Writes the Plot: The final nightmare twist was filmed after the episode came back short.
- Red Shirt: Subverted with Hawkins. He's the only non-main character on the away mission, but he survives.
- Sound In Space: The asteroids crash against each other.
- Stun Guns: The MACO takes his rifle off stun when the stunned Vulcans get back up again. Archer and T'pol have to order him to belay that.
- Teleporter Accident: An anomaly passes through the transporter at the worst moment, and the rock that Trip was beaming up materializes all over the walls. He even notes "this'll be a new one for the maintenance team."
- Unobtanium: Enterprise finds the Seleya in an asteroid field that's rich with trellium ore. Unfortunately, it turns out that trellium is deadly to Vulcans.
- Zombie Gait