The X-Filesfollowed FBI agents Fox Mulder and Dana Scully, respectively portrayed by David Duchovny and Gillian Anderson, as they took on cases that were more bizarre in nature. Each case showed the supernatural and otherworldly side of the universe with creatures that would be tough to explain without seeing them first. However, one of the first milestone episodes featured a trio of characters that many could describe with ease. In fact, they might have been one of the most mundane the show had seen at that point.

The Trinity Killers weren’t nearly as mundane as the monsters in season four’sHome, but they were close, being only vampires who stalked the night. Coming off the nail-bitingDuane BarryandAscensionepisodes that saw amajor government conspiracyand kidnapping, Agent Fox Mulder found himself in Los Angeles after a woman meets a man at a corporate party and kills him in a hot tub by biting him and stabbing him with hypodermic needles.

The Son from The X-Files season 2 episode 7

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Finale Date

June 04, 2025

In the first episode without Gillian Anderson, Agent Mulder was left to his own devices and landed himself in Los Angeles, California, after a string of murders from another state led him there. The murders are biblical in nature due to the killers writing scripture in the victims' blood, leading Mulder to classify them as the “Unholy Trinity.” Nobody would ever call Agent Fox Mulder a skeptic when it came to paranormal or supernatural events, but when it came to vampires, he believed it was all a myth.

That changed when Mulder’s investigation led him to a security guard at a local blood bank. Mulder caught the guard drinking blood that the facility stored, prompting Mulder to arrest him. During the interrogation, the guard would divulge that he was a part of a trio ofvampires seeking immortality. He was “The Son” and his other two accomplices were known as “The Father” and “The Unholy Spirit.” Mulder scoffed at the sentiment due to his lack of belief in vampires, but when he pulled the shades to expose the interrogation room to sunlight, “The Son” burned to death, definitively proving that he was a vampire.

David Duchovny as Fox Mulder in The X-Files season 2 episode 7

Mulder is led to a “vampire nightclub” after finding a business card of the suspect’s body. If he was working with two others, the case was far from over. Staking out the nightclub introduced Mulder to a young woman named Kristen Kilar, who lived in Memphis and Portland before LA. Memphis and Portland were both locations where the same string of murders occurred, making Kristen a person of interest. Mulder would eventually learn that Kristen had a relationship with The Son but left him after she learned that he and his two accomplices were committing murders.

Despite Kristen having ties to the Unholy Trinity, Mulder couldn’t stop himself from growing an emotional connection to her. Up until this point, Duchovny’s character had been noticeably celibate. The series creator, Chris Carter, wanted to take the opportunity to change that with Scully temporarily out of the picture. Duchovny was more than happy, as he toldEntertainment Weeklyin 1994:

Perry Reeves as Kristen in The X-Files season 2 episode 7

Everybody else gets the girl on that show. I’m always alone with my dog.

Which X-Files Episode Features the Trinity Killers?

The Trinity Killers debuted in the seventh episode ofThe X-Files’second season, aptly titled3. It takes place after a monumental story about Agent Scully going missing and seemingly being abducted by aliens. It’s the first episode without Gillian Anderson appearing even a single time because she went on maternity leave to give birth to her first daughter. While the episode received mixed reviews, its initial airing garnered over 9 million households tuning in. It was the only episode to feature the Unholy Trinity killers.

What Happens to the Trinity Killers?

Despite spontaneously erupting into flames, The Son returned from death. He stalked Mulder and Kristen, even observing them share some more passionate moments. While Mulder slept, The Son told Kristen that she had to kill the FBI agent and drink his blood if she wanted to become a vampire like the Unholy Trinity. She agreed verbally but declined emotionally. As Kristen approached Mulder with a knife, she turned her direction to the bedroom where The Father was hiding and stabbed him.

This forced The Son out of hiding to attack Mulder. After a brief scuffle, Mulder overpowered his vampiric opponent and tied him to a column using a cord from a TV. Without a single word spoken between the three, Mulder grabbed Kristen and made a run for her car in the garage. Just as the engine ignited and Mulder was ready to high-tail it out of there, The Unholy Spirit made herself known and jumped onto the hood of the car. She reached through the car’s skylight, shattering the glass, and ripped Mulder from the driver’s seat. Kristen didn’t waste a moment to think, as they weredealing with supernatural entities, and jumped into the driver’s seat to throw the car in reverse, which forced The Unholy Spirit and Mulder to fall onto the ground.

The Unholy Spirit loomed over the fallen Mulder, but Kristen used that quick thinking of hers again after seeing the vampire standing in front of some pointy coat hangers on the garage wall. She threw the car into drive and slammed it into The Unholy Spirit, impaling her heart with the wooden coat hanger. When Mulder runs back inside to get The Son, Kristen tricks him back outside, allowing her to sneak into the house, pour gasoline everywhere, and burn herself alive along with The Son.

Why was there a jug of gasoline in the house? It was the ’90s. Not everything made the most sense incinema back then, but it helped conclude the story of the Trinity Killers by having them all die.

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