Worshiped spinal parasite being carried

The members of a cult carrying their sacred parasite

The worshiped spinal parasite was a kind of gastropod parasite that was worshiped by a cult who believed it was the second coming of Jesus Christ. FBI Special Agent Dana Scully encountered the mollusc when she was treating Hank Gulatarski, who was one of the hosts for the creature. Hank was stoned to death after Scully failed to remove it. The parasite was transferred to Scully. However, Special Agent Doggett arrived and removed the parasite from Scully's body before finally shooting the parasite to death. (TXF: "Roadrunners")