By Brian VanHooker Published Sep 23, 2026, 12:00 AM EDT Analysis With apologies to the Great Mutato
Image: 20th Century Fox/Everett Collection Sign in to your Polygon.com account Add Us Summary Generate a summary of this story Like Like follow Follow followed Followed Thread Log in Here is a fact-based summary of the story contents: Try something different: Show me the facts Explain it like I’m 5 Give me a lighthearted recap Generally speaking, there are two different kinds of episodes of The X-Files . There are the serialized “Mythology” episodes, which deal with the show’s central, ongoing story about aliens and the government conspiracy surrounding them. These kinds of stories usually get top billing each season as the premiere and finale with a few more sprinkled in throughout the season. Then there are the procedural “Monster of the Week” episodes, during which Agents Mulder (David Duchovny) and Scully (Gillian Anderson) investigate some standalone cases entirely unrelated to aliens. And while mythology episodes would sometimes take on an outsized importance in the eyes of fans, the vast majority of The X-Files — like, probably, 75 percent of the show, if not more — were Monster of the Week stories.
The term “monster” is used liberally, mind you, because here it could refer to any weird new creature, case, or even superpowered person. Regardless, there were a lot of different monsters on the show, but all of them fall short of one the show introduced during a season 2 episode called “The Host.”
“The Host” was the second episode of season 2. It takes place during a period when the X-Files division of the FBI has been shut down. Mulder is sent on a case involving a waterlogged body found in the Newark, NJ sewer system, and he is convinced it's a punishment from his bosses at the FBI. Over the course of the investigation, however, he finds out that this is, indeed, an X-File.
When Agent Scully performs an autopsy on the body, she finds a flukeworm in its liver. Soon after, a city sanitation worker is attacked in the sewer system by what he believes to be a python, but the giant bite mark on his back matches the mouth of a flukeworm, although much, much larger. After the sanitation worker dies, Mulder visits the sewage treatment plant, which has accidentally captured a creature that has the size and shape of a man, but with the face and mouth of a flukeworm. Soon after, the Flukeman, as the creature comes to be known, begins attacking workers at the sanitation plant in an effort to escape.
Image: Ken Staniforth/Fox Network/Everett Collection There are a number of reasons why the Flukeman is so highly regarded by fans. For one thing, his look is just incredibly original. While there are man-like/sea creature elements that harken back to the classic Creature from the Black Lagoon, the bright white monster and his giant, oval flukeworm mouth made him instantly memorable. The episode was also executed with cinema-level practical creature effects, which were rare on TV at that time. “The Host” was also a tightly-written sci-fi thriller story by X-Files creator Chris Carter . It also contained a then-timely real-world element, as the Flukeman is suggested to be a product of the Chernobyl nuclear disaster in Ukraine, which occurred less than a decade before this episode ran. The episode also ran during a time when the show was exploding in popularity, and since it was not part of the show’s mythology, it was an easy episode to revisit wi…