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Mundanger: Zig-zagged. The X-Files usually created scary atmosphere by something paranormal and straight use of Mundanger would suggest troubles caused by something ordinary, for example creepy cockroaches. There really is a mass hysteria created by cockroach infestation which is Primal Fear in itself. Also, there are several deaths. However, at least one of the cockroaches was made of metal and its technology was way too advanced to come from our planet. Some of the cockroaches really are robotic aliens. However, it's unclear if there are actually more of these. The others may very well be just the common kind. In addition, it turns out that the cockroaches - either alien robotic ones or common earth ones - were not the direct cause of the deaths that appeared in the episode.
Nerds Are Sexy: Scully on the budding romance of the doctors: "Smart is sexy."