In "Nightfall", Hunter Boyce was infected with a huge, tapeworm-like parasite after drinking unfermented Taroca root. It causes severe pain, presumably internal bleeding, sudden weight loss, and, if left untreated, eventually death. The parasite was at least 30 feet long. At the clinic, Dr. Elisabeth Shannon had to manually remove the parasite by pulling it through a hole cut in Hunter's side, since all of the technology in the colony would not function properly due a meteor strike. Because she had to look after another patient, Elisabeth turned the operation over to Skye. She became distracted when Hunter expressed his feelings for her, allowing the parasite to break off from its exposed part and slither back into Hunter's body. The parasite was later killed through a sonic operation after power was restored.