Monster of the week: See title.
Not the best monster, or story.
Notable mostly, since I care far more about the characters than the story, for Mulder’s first obvious jealous twinge regarding Scully and Scully duly taking note and appearing more amused and flattered than offended.
Which shows, as compared to the later dialogue regarding said “relationship”, that subtlety can often reveal far more than blatant exposition. Or, as they say, “Insinuation really makes it happen”.
Reaffirmed when Scully, with just a bit of guilty/gloatingly independent reluctance, tells Mulder she has a date: which of course she doesn’t enjoy one bit.