[[WMG:[[center:[-'''RECAP:'''\\
[[Recap/TheXFiles Index]] | [[Recap/TheXFilesS09E01NothingImportantHappenedToday 1]] | [[Recap/TheXFilesS09E02NothingImportantHappenedTodayII 2]] | [[Recap/TheXFilesS09E03Daemonicus 3]] | '''4''' | [[Recap/TheXFilesS09E05LordOfTheFlies 5]] | [[Recap/TheXFilesS09E06TrustNo1 6]] | [[Recap/TheXFilesS09E07JohnDoe 7]] | [[Recap/TheXFilesS09E08Hellbound 8]] | [[Recap/TheXFilesS09E09Provenance 9]] | [[Recap/TheXFilesS09E10Providence 10]] | [[Recap/TheXFilesS09E11AudreyPauley 11]] | [[Recap/TheXFilesS09E12Underneath 12]] | [[Recap/TheXFilesS09E13Improbable 13]] | [[Recap/TheXFilesS09E14ScaryMonsters 14]] | [[Recap/TheXFilesS09E15JumpTheShark 15]] | [[Recap/TheXFilesS09E16William 16]] | [[Recap/TheXFilesS09E17Release 17]] | [[Recap/TheXFilesS09E18SunshineDays 18]] | [[Recap/TheXFilesS09E19TheTruth 19]] | [[Recap/TheXFilesS09E20TheTruthII 20]]]]-]]]
'''Season 9, Episode 04:'''
!4-D
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/thexfiles4d.png]]
[[caption-width-right:350:''[[TagLine erehT tuO si hturT ehT]]'' [[labelnote:Translation]]"The Truth is Out There" typed backwards.[[/labelnote]]]]
->Written by Steven Maeda\\
Directed by Creator/TonyWharmby

->''"We've got the block surrounded. He isn't vanishing anywhere. And your partner volunteered. Now, open the [[TitleDrop 4-D]]."''
-->-- '''Brad Follmer''', who was talking about a letterbox, but unintentionally meant something far more sinister.

A serial killer who can travel between parallel universes targets Doggett and Reyes.
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!!Tropes:
* BehindTheBlack: {{Justified|Trope}}; Lukesh's ability to step between worlds means he can literally come out of nowhere.
* BigDamnHeroes: Follmer swoops in just in time to shoot Lukesh in the head, saving Reyes from him.
* BittersweetEnding: Lukesh is stopped and the normal Doggett is brought back, the dimension restored, but the alternate universe Reyes and Doggett, among Lukesh's other victims in that world, are still dead.
* EvenBadMenLoveTheirMamas: Lukesh diligently cares for his mother, and when she calls him out on his suspicious behavior and claims she'll go to the FBI, he begins crying profusely as he kills her to keep her silent, then blames Reyes for making him do it.
* ExpendableAlternateUniverse: Lukesh's M.O. With his ability to step between worlds, he commits horrible crimes in the one universe while living a normal life free of suspicion in the other. Ultimately the alternate Reyes and Doggett are both dead.
* TheGreatestStoryNeverTold: Reyes is going to have a hell of a time explaining the events of the episode, if she even decides to.
* ObstructiveBureaucrat: Follmer as ever, though he eventually proves his usefulness.
* PunnyName: 4-D refers to the locker number belonging to Lukesh and also his ability to move through multiple worlds.
* ResetButton: Reyes theorizes that Doggett accidentally moved between universes, displacing that universe's Doggett in the process. Doggett ultimately agrees and submits his own theory that the original Doggett will be able to return if he dies. Reyes takes Doggett off of life support and he dies, returning things back to normal, [[ExpendableAlternateUniverse for our universe, at least]].
* ShipTease: Plenty of it between Reyes and Doggett for this episode.
* SlashedThroat: How Lukesh kills the alternate Reyes.
* UselessSecurityCamera: Although Reyes' place is fitted with all sorts of security cameras, Lukesh manages to warp into a blind spot and corner her. Fortunately, the prolonged absence of Reyes on camera is suspicious enough to bring everyone running just in time to save her.
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->'''Doggett:''' Monica, what's wrong?\\
'''Reyes:''' I'm good. Good.