Generally speaking, there are two distinct categories of episodes that define the television landscape of The X-Files. On one hand, viewers tuning into the iconic sci-fi series were met with the serialized “Mythology” episodes. These narrative pillars grappled with the show’s sprawling, overarching conspiracy involving extraterrestrial life and shadowy government entities pulling strings behind the scenes. These mythology-driven stories typically commanded high-profile status during every television season, anchoring the high-stakes premieres and finales, with a select few more strategically sprinkled throughout the regular run.
On the other hand, the series relied heavily on the procedural “Monster of the Week” format. In these standalone installments, FBI Special Agents Fox Mulder, played by David Duchovny, and Dana Scully, played by Gillian Anderson, packed their bags and traveled across the country to investigate strange, inexplicable cases entirely divorced from the alien conspiracy plotline. While mythology episodes frequently carried an outsized sense of importance in the eyes of dedicated fans trying to decode the grand narrative puzzle, the vast majority of The X-Files—accounting for roughly 75 percent or more of the entire series—consisted of these self-contained Monster of the Week stories.
The term “monster” itself was utilized quite loosely by the creative team, functioning as a catch-all descriptor for any bizarre creature, supernatural phenomenon, or uniquely mutated individual the agents happened to encounter. Throughout its lengthy run, the series introduced a staggering variety of creatures and anomalies. Yet, remarkably, all of them ultimately pale in comparison to one particularly grotesque entity introduced during a second-season episode titled "The Host."
The Host
“The Host” served as the second episode of The X-Files Season 2, arriving at a delicate narrative juncture when the dedicated X-Files division of the FBI had been temporarily dismantled and its agents reassigned. Mulder, effectively sidelined, is dispatched by his superiors to investigate a grim, waterlogged corpse discovered deep within the murky labyrinth of the Newark, New Jersey sewer system. Convinced that the assignment is nothing more than a punitive measure designed to demean and frustrate him, Mulder approaches the case with a degree of cynicism. However, as he digs deeper into the physical evidence and the surrounding environmental anomalies, he quickly realizes that this grotesque discovery is, without a shadow of a doubt, a genuine X-File.
During the subsequent forensic examination, Agent Scully performs an autopsy on the recovered body and uncovers a horrific biological surprise: a massive flukeworm nestled inside the victim’s liver. Shortly after this discovery, a local city sanitation worker is viciously assaulted in the subterranean darkness of the sewer network. The worker initially suspects he was targeted by an escaped python, but the medical evaluation reveals a startling truth. The massive, severe bite mark left on his back perfectly matches the anatomical structure of a flukeworm mouth, albeit scaled up to monstrous, impossible proportions.
Following the tragic death of the sanitation worker, Mulder visits a local sewage treatment facility that has managed to capture a mysterious entity. The captured creature possesses the general height and bipedal shape of a grown man, but its upper anatomy features the nightmarish face and gaping, circular mouth of a giant flukeworm. Soon afterward, the entity—which quickly comes to be known by fans and investigators alike as the Flukeman—begins relentlessly attacking workers at the plant in a desperate, violent effort to escape captivity and return to the subterranean waters.
There are numerous reasons why the Flukeman has endured as one of the most celebrated and highly regarded creations in the history of the series. For starters, the creature’s visual design is exceptionally original and striking. While it incorporates classic man-like and aquatic creature elements that clearly harken back to Universal horror icons like the Creature from the Black Lagoon, the stark, unsettling white skin of the monster combined with its massive, gaping, oval-shaped flukeworm mouth made it instantly iconic and unforgettable to viewers.
Furthermore, the episode was executed with cinema-level practical creature effects, a standard of physical craftsmanship that was exceedingly rare for network television at that time. "The Host" was also anchored by a tightly wound, suspenseful sci-fi thriller script penned by X-Files creator Chris Carter. The episode cleverly integrated a timely, real-world anxiety into its fictional narrative, suggesting that the Flukeman was a horrifying biological byproduct of the catastrophic Chernobyl nuclear disaster in Ukraine, which had occurred less than a decade prior to the episode’s initial broadcast.
Compounding its cultural impact, the episode aired during a period when the series was rapidly exploding in mainstream popularity. Because it stood entirely outside the dense continuity of the show’s overarching alien mythology, it served as an accessible, self-contained nightmare that viewers could easily revisit without needing to binge a dozen preceding episodes to understand the context.
In the decades since its debut, the Flukeman has effectively transformed into an unofficial mascot for the Monster of the Week era of The X-Files as a whole. Outside of the series’ core extraterrestrial elements, the monstrous entity you are statistically most likely to encounter on official The X-Files merchandise is the Flukeman. This widespread merchandising presence remains somewhat surprising and impressive given that the character physically appeared in only a single episode of the entire television run. For instance, when Lego released its official X-Files building set, the package thoughtfully included a collection of human federal agents, a standard grey alien, and only one other creature representation: the Flukeman.
Throughout the long and storied broadcast history of the series, countless fascinating and grotesque monsters came and went, leaving their mark on the cultural lexicon. From the immortal, liver-eating serial killer Eugene Victor Tooms to the deeply disturbing and terrifying inbred Peacock family in the infamous episode "Home," the show never lacked for nightmares. Yet, among all the strange phenomena investigated by Mulder and Scully, none managed to burrow quite as deeply into the collective minds of fans quite like the Flukeman.
