* {{Hyperspace|IsAScaryPlace}}: Everything is a bright swirling mess, currents pushing ships this way and that, if you lose your navigation systems or your engines, you will drift off the plotted route and will, in all likelihood, be LostForever. Even in the event of full-scale war, very few of the races are willing to fight in Hyperspace for this reason.
** To make it worse, there are even rumors that there is... ''something''... living in Hyperspace. [[spoiler: The rumors are true, although the Shadows are more haunting it than anything. The actual things we see living in Hyperspace, the giant jellyfish things in Crusade, are benign, if silly.]]
** FromBadToWorse: once you find out that Hyperspace is ''not'' the only alternate dimension, and you begin to deal with things such as Thirdspace, which is home to... [[EldritchAbomination something much worse.]]
* Dr. Franklin gives us a vivid first-hand story about how he got to watch a friend of his [[ThrownOutTheAirlock accidentally get spaced.]] Struggling, desperately flailing his arms and legs, trying to breathe... and death by spacing is not a swift experience.
--> '''Franklin:''' "A lot of people make jokes about 'spacing' somebody. About 'shoving somebody out an airlock'....[[http://www.youtube.com/watch?v=Tq6bYoP0grg I don't think it's funny.]]"
* The "Soldier of Darkness" from "The Long Dark". [[NothingIsScarier It's invisible]], can supposedly travel through walls, and it [[BodyHorror pulls your organs out through your mouth.]]
* Death by MindRape. And if in your dying moments you should think of your friends or loved ones, they will be put in danger as well.
** The na'kaleen feeder from "Grail" combines this with the Soldier of Darkness. The Centauri quarantined an entire planet just to contain the threat this entity posed, and they're one of the more advanced races of the B5-verse.
* The entire concept of the Minbari War: one man's tragic mistake nearly dooms his entire race to extinction.
** The fanaticism a species would have to condone such an action is scary too.
* The Psi Corps, anybody?
** Speaking of the Psi Corps, let's talk about Bester. They say that if a telepath is in contact with a person's mind as they die, part of their soul is taken as the dying person passes on. They say that Bester used to ''volunteer'' for these assignments, and that's why he is the way he is. Who would have thought the guy most famous for mispronouncing "nuclear vessels" would go on to play one of the most sinister characters in science fiction?
-->'''Talia Winters''': "Psi Cops are trained to make people feel uncomfortable. Bester makes ''[[UpToEleven other Psi Cops]]'' feel uncomfortable!"
** And then there's the alternative to the Psi Corps--being administered sleepers on a regular basis, which over time dull the mind until there's little (if any) personality left.
* Pretty much the entire episode "Intersections in Realtime", partially because it's done in a way that feels very brutal and real.
* As awesome as it was, Lyta mind-controlling the entire bar in "Wheel of Fire". Just imagine that you're one of those customers.
* G'Kar's whole experience with [[PsychoSerum Dust]]. From his rage-distorted features, to him flinging Vir around like a ragdoll (it's not even clear if Vir is alive at that point), to his MindRape of Londo, where he carried a disturbing resemblance to [[Franchise/ANightmareOnElmStreet Freddy Krueger]].
* Wasn't there an episode where Garibaldi had to confront a psycho dummy? If that were the case, then that was likely one of the most scariest episodes.
** That was Gray 17 is Missing. So, no. :/
** [[FanonDiscontinuity We don't talk about Garibaldi's weird acid trip adventure in Grey 17.]] [[OldShame JMS doesn't really like to either.]]
* The Drakh and their [[PuppeteerParasite Keepers]]. Particularly in the [[ExpandedUniverse Centauri Trilogy]] books, Shiv'kala (the [[TheChessmaster lead Drakh operative]] on Centauri Prime) is described as materializing "out of the shadows" in a room, and blending back into them when he's done meeting with/confronting Londo. Plus the intensity of pain the Drakh can transmit through the Keeper onto the one who bears it is described in a bit more detail in the books. The whole concept of being controlled by such a thing for the remainder of life may be something described as a fate worse than death.
* The ''[[ExpandedUniverse Passing of the Techno-mages]]'' trilogy had its share of nightmare fuel, particularly in the final novel with the things Galen saw on Z'ha'dum in its industrial hub surrounding the Eye: masses of live sentients herded down grim corridors to be dismembered and used to make the "substrate" of Shadow vessels, or their neural systems being made into [[spoiler: Technomage chrysalises]]. As horrible an imagining of hell as anything, in those vast underground corridors. Then imagine [[spoiler: Weirden]] (who Galen was intended to replace) being forced to be the neural hub of the Eye, which directed all that activity, for [[spoiler: 1000 years]].
* The various scenes of the [[TheGreys Streib]] and their whirring instruments (all depicted from the vantage point of their victims lying prone beneath them), from Sheridan's experience on their ship ("All Alone in the Night"), to Carolyn's flashbacks ("Ship of Tears"), to Londo's being prepped for his [[PuppeteerParasite Keeper]]. All of these are remembered as nightmares, implying their PlayingWithSyringes is done while the victim is in some kind of sleep or trance but the mind remembers it.
* Mr. Morden: "Flesh does what it's told." ''Brrr.''
* Emperor Cartagia: scarier than the Vorlons and the Shadows because he's all too real. The nightmare of dealing with a madman - of never knowing whether or not what you say or do will set him off and cause him to kill you and your entire family. Also? He just sold out your planet to a race of [[EldritchAbomination eldritch abominations]]. Sleep tight!
** The worst part? He wasn't tricked, or lied to, at the most the "cost" of the deal was underexaggerated. This man pulled a DealWithTheDevil on behalf of his entire race, ''willingly and knowingly''. And he's the one in charge of the second or third most advanced of the "young" races.
* The very concept of Soul Hunters, in a universe where souls are not only real but ''physically observable''. Imagine being denied whatever afterlife may exist/you personally believe in just to be confined to a jar for someone's "collection" for all eternity. No wonder most races react to the Soul Hunters with extreme hostility!
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