The X-Files (1993–2016) 
Two FBI agents, Fox Mulder the believer and Dana Scully the skeptic, investigate the strange and unexplained while hidden forces work to impede their efforts.
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The X-Files: Squeeze Rewatch Season 1, Episode 3
Scully and Mulder pick up the slimy yellow trail of a serial killer who attacks his victims in seemingly secure locations and removes their livers... at 30-year intervals.
The X-Files: Deep Throat Rewatch Season 1, Episode 2
Scully and Mulder travel to Idaho to investigate the disappearance of Lt. Col. Budahas who, according to his wife, began acting strangely and developing a bodily rash, and then was taken into military custody.
The X-Files: Pilot Rewatch Season 1, Episode 1
FBI agent and medical doctor Dana Scully is assigned to work with Special Agent Fox Mulder in the expectation that she will "apply the proper scientific analysis" to his work. Together the two agents travel to Oregon to investigate the case of a young woman found dead in the woods of no discernible cause.
The X-Files: My Struggle IV Season 11, Episode 10
Mulder and Scully rush to find an on-the-run William while the Cigarette Smoking Man pushes forward with his ultimate plan. [Season finale; CW: exploding people] [more inside]
The X-Files: Nothing Lasts Forever Season 11, Episode 9
While investigating human organ theft, Mulder and Scully uncover a mysterious cult consumed with macabre rituals. [CW: gory surgery and dissection scenes] [more inside]
The X-Files: Familiar Season 11, Episode 8
Mulder and Scully suspect that darker forces are at play as they investigate a brutal animal attack on a little boy in Connecticut. [Official synopsis] [CW: violence to children, mostly unseen] [more inside]
The X-Files: Rm9sbG93ZXJz Season 11, Episode 7
In a world of ever-increasing automation and artificial intelligence, Mulder and Scully find themselves targets in a deadly game of cat and mouse. [Official synopsis] [more inside]
The X-Files: Kitten Season 11, Episode 6
Skinner goes AWOL when his past comes back to haunt him. As Mulder and Scully try to track him down, their growing mistrust of him reaches its apex. [more inside]
The X-Files: Ghouli Season 11, Episode 5
When a pair of teenage girls attack one another, each believing the other to be a monster, Mulder and Scully find that their investigation could possibly lead back to their long-lost son, William. [more inside]
The X-Files: The Lost Art of Forehead Sweat Season 11, Episode 4
While exploring the idea of the Mandela Effect, in which groups of people remember an alternate history, Mulder and Scully discover how the X-Files may have originated. [more inside]
The X-Files: Plus One Season 11, Episode 3
A spate of deaths in which victims are plagued by their own doppelgangers leads Mulder and Scully to a pair of twins playing a dangerous game. Mulder, to Scully: "you and I are gonna jump on I-95 South this morning and get back to our bread and butter." [Yes, it's a Monster of the Week episode!] [more inside]
The X-Files: This Season 11, Episode 2
Per IMDB, "A chilling secret is revealed when an old friend reaches out to Mulder and Scully in a seemingly impossible way." Per me, "FBI special agents Fox Mulder and Dana Scully fall asleep on a couch in front of the TV, only to be awoken by a mysterious phone call." [more inside]
The X-Files: My Struggle III Season 11, Episode 1
Picking up after the last event series’ cliffhanger, Mulder and Scully learn that they aren’t the only ones desperately searching for their long-lost son, William. The very fate of the world may depend on it. [more inside]
The X-Files: Season 10 Postmortem Thread Season 10 (Full Season)
As requested in a couple of threads for individual episodes, this thread is here so we can talk about the season as a whole. [more inside]
The X-Files: My Struggle II Season 10, Episode 6
Scully must look within to try and find a cure when people all over the country suddenly start falling gravely ill.
The X-Files: Babylon Season 10, Episode 5
When an art gallery that's showing potentially offensive artwork is bombed, Mulder and Scully seek some way to communicate with the comatose bomber in order to prevent a future attack. Meanwhile, a pair of younger FBI agents on the case (guest stars Robbie Amell and Lauren Ambrose) push Mulder and Scully to examine their own beliefs as Scully seeks answers from neuroscience and Mulder from mysticism. [more inside]
The X-Files: Home Again Season 10, Episode 4
Mulder and Scully are sent to investigate the murder of a city official, which it seems no human could have committed. Meanwhile, Scully deals with a personal tragedy, which brings up many old feelings about the child she gave away for adoption. [more inside]
The X-Files: Mulder and Scully Meet the Were-Monster Season 10, Episode 3
When a dead body is found in the woods, Mulder and Scully are called in to investigate whether it was an animal attack, a serial killer or just maybe a strange creature as described by eyewitnesses. Meanwhile, Mulder is able to confront some of his own demons about feeling disillusioned with his life's work. [more inside]
The X-Files: Founder's Mutation Season 10, Episode 2
When a scientist suddenly commits suicide, Mulder and Scully investigate what unseen force may have driven him to it. What they uncover is a laboratory where extreme genetic experimentation has been going on for decades, breeding subjects who possess unexpected and dangerous powers - and who harbor deep resentments. [more inside]
The X-Files: My Struggle Season 10, Episode 1
This 2016 pilot reintroduces "The X-Files" and reunites Agent Mulder with Dana Scully after the collapse of their relationship when Mulder is engaged by a TV host. Mulder proclaims new evidence that alien abductions have been faked. [more inside]
The X-Files: Field Trip Rewatch Season 6, Episode 21
A mystery involving two skeletons leads the agents on a journey in which nothing is quite as it seems. [more inside]
The X-Files: Monday Rewatch Season 6, Episode 14
A woman is trapped in an endlessly repeating time loop that ends in a tragic bombing in which Mulder and Scully lose their lives every time. [more inside]
The X-Files: Triangle Rewatch Season 6, Episode 3
Lost in the Bermuda Triangle, Mulder believes he has traveled back to 1939 and has to evade Nazis aboard an historic British sailing ship similarly lost, encountering individuals who seem strikingly familiar to him. [more inside]
The X-Files: Drive Rewatch Season 6, Episode 2
Mulder finds himself forced to drive a man in a high-speed dash across the Southwest in an effort to prevent the man's head from exploding. [more inside]
The X-Files: Bad Blood Rewatch Season 5, Episode 12
After Mulder kills a teenage boy who he believed was a vampire, he and Scully recount the events that led to the killing. [more inside]
The X-Files: The Post-Modern Prometheus Rewatch Season 5, Episode 5
Mulder and Scully's investigation of a letter from a single mother leads them to a small mid-Western town where a modern-day Frankenstein lurks, Jerry Springer is an obsession, and Cher plays a significant part. [more inside]
The X-Files: Small Potatoes Rewatch Season 4, Episode 20
A town celebrates a surprising number of births in a short span of time, only all the newborns have tails... [more inside]
The X-Files: Never Again Rewatch Season 4, Episode 13
Scully takes some time off from Mulder and discovers a man with a jealous tattoo. [more inside]
The X-Files: Home Rewatch Season 4, Episode 2
When a deformed baby's body is found buried in a baseball field, Mulder and Scully investigate a family suspected of inbreeding. [more inside]
The X-Files: Jose Chung's From Outer Space Rewatch Season 3, Episode 20
An alien abduction of two teenagers with different versions of the same facts prompts a science-fiction novelist to write a book about the incident. However, no one involved with the investigation can tell him the full story with any accuracy. [more inside]
The X-Files: Pusher Rewatch Season 3, Episode 17
Mulder and Scully pursue a dying man who can apparently bend others to his will and convince his victims to severely hurt or even kill themselves. [more inside]
The X-Files: Clyde Bruckman's Final Repose Rewatch Season 3, Episode 4
Mulder and Scully receive help in the investigation of a murder case from a reluctant psychic. [more inside]
The X-Files: Humbug Rewatch Season 2, Episode 20
A bizarre murder in Florida brings Mulder and Scully to a town populated by circus freaks and sideshow performers of all shapes and sizes, bringing into question the very definition of "normal." [more inside]
The X-Files: Die Hand Die Verletzt Rewatch Season 2, Episode 14
After a teenager is ritualistically murdered in a small town, Mulder and Scully are caught up in a secret occult practice within the local PTA and a substitute teacher with odd powers. [more inside]
The X-Files: E.B.E. Rewatch Season 1, Episode 17
After a downed UFO crashes near Iraqi airspace, Mulder and Scully follow an unmarked truck carrying the UFO's occupant. [more inside]
The X-Files: Beyond the Sea Rewatch Season 1, Episode 13
After Scully's father dies suddenly, her skepticism is put to the test by a prisoner on death row, who claims that – by using recently gained psychic powers – he can help her catch a kidnapper. [more inside]
The X-Files: Ice Rewatch Season 1, Episode 8
In an Arctic research station, Mulder and Scully are threatened by primordial ice worms that cause their hosts to become dangerously paranoid. [more inside]
The X-Files: Sanguinarium Rewatch Season 4, Episode 6
A series of bizarre murders in a hospital's plastic surgery unit lead Mulder and Scully to believe that witchcraft is somehow involved. [more inside]