History NightmareFuel / MenInBlackTheSeries

Jeebs is usually a ButtMonkey who is constantly switches sides. The Heads You Lose Syndrome shows that not even children are safe from Jeebs’ DirtyCoward behavior. To avoid repercussions from Alpha, he abducts an alien baby in front of his parents so Alpha can cut off the child’s arm. The dark element is lightened by the fact that the baby [[CurbStompBattle quickly]] [[LaserGuidedKarma pummels him]] not too long after. This is truly Jeebs’ darkest and lowest moment in the series to the point you don’t feel that bad for him when he [[ItMakesSenseInContext crashes into Mount Rushmore at the end of the episode]].

* [[AliensAreBastards Vangus]], the co-antagonist of the two-part "[[GrandFinale The Endgame Syndrome]]", can easily match Alpha in terms of [[KnightOfCerebus vileness]] (if not even more so). Vangus is an Ixion commander who leads an [[AlienInvasion invasion of Earth]] in order to steal all oil from the planet. When the Earthlings successfully counter-attack with the help of some alien allies, he decides to launch a missile that would [[KillAllHumans destroy everyone on the planet]] while saving the petroleum for himself, ''effectively screwing over Alpha'' (who intended to enslave any surviving humans). Although his evil plans are fortunately thwarted, [[KarmaHoudini Vangus escapes unharmed]] [[FridgeHorror in the end]].

* The Skraaldians from the pilot episode ("The Long Goodbye Syndrome") end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as [[AttackOnOneIsAnAttackOnAll a target of revenge for the entire race]], due to them being a psychically-linked HiveMind. Worse, they can hide in the bodies of other aliens as parasites and [[ChestBurster burst from their chests]] to get to their victim, and masquerade as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing to get stung by one, swelling up and turning the color of rotten eggplant for a week, just to avoid their wrath. As Kay describes to Agent J after he killed one of them:

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** There's also how Forbus first shows how the link works; [[TheSadist he grabs the radiator of a car and forces K to feel the pain]].

* During the episode "The Buzzard Syndrome" which introduces [[BountyHunter Buzzard]], there's also the creature known as [[KillerRabbit Z-Ron]]. While Buzzard himself is rather creepy (being [[LeanAndMean extremely tall]], pale-skinned, [[EvilSoundsDeep deep-voiced]], wears a black coat to disguise his inhuman body) and proves that he's ''not'' a good guy (he tries to kill Agent K to keep him from interfering with Buzzard's bounty-hunt), his target turns out to be ''much'' worse. Z-Ron is a (literally) predatory, savage, vicious SerialKiller who travels around space to kill and eat other sapient aliens; he initially resembles a [[CuteIsEvil "harmless" teddy bear]] to lure his victims into a false sense of security before [[OneWingedAngel turning into a hideous monster]] to attack them. His spaceship is filled with ''about a dozen different alien skeletons'', and decides sometime to add humans to his menu -- [[WouldHurtAChild he tries to hunt a young boy]] ([[FalseFriend by befriending and playing with him first]]) and later fools Agent J as well, chasing them both through a forest. This sadistic monster is definitely one of the nastiest [[MonsterOfTheWeek one-time villains]] in the series.

** Also, Jay has no idea that the "Kay" the aliens captured is a decoy - as far as he knows at the time, Kay is dead because of his mistake.

** Also, said confrontation has Kay preparing for a MutualKill by using a poison gas that Alpha's alien hostage can survive. He stops only just in time as Jay and Elle show up. Probably the closest Kay came to death in the series.

** Piggybacking on that, Alpha first starts as looking human enough that he can wear a MIB suit, though he exposes himself as having several alien heads attached to his own body. Then he appears shrivelled, balding and old. He then evolves, gaining a cybernetic eye and becoming a hunched being with nothing human EXCEPT his head. Eventually, after a jaunt in the Antarctic where our heroes knock him into the freezing waters, he emerges with his body entirely black from frostbite, pieces crumbling away and his lips and nose gone, with his face almost skull-like as he approaches

** Kay managed to get Jay out of the Skraaldians' hit-list by hiring an Arquillian (who was [[MobileSuitHuman piloting a robot suit decoy]] that looked like Kay, [[ItMakesSenseInContext blowing his nose to draw the Skraaldians to himself]]), but if he hadn't Jay (and potentially Kay) would have been dead men for certain.
* During the episode "The Buzzard Syndrome" which introduces [[BountyHunter Buzzard]], there's also the creature known as [[KillerRabbit Z-Ron]]. While Buzzard himself is rather creepy (being [[LeanAndMean extremely tall]], pale-skinned, [[EvilSoundsDeep deep-voiced]], wears a black coat to disguise his inhuman body) and proves that he's ''not'' a good guy (he tries to kill Agent K to keep him from interfering with Buzzard's bounty-hunt), his target turns out to be ''much'' worse. Z-Ron is a (literally) predatory, savage, vicious SerialKiller who travels around space to kill and eat other sapient aliens; he initially resembles a [[CuteIsEvil "harmless" teddy bear]] to lure his victims into a false sense of security before [[OneWingedAngel turning into a hideous monster]] to attack them. His spaceship is filled with ''about a dozen different alien skeletons'', and decides to add humans to his menu -- [[WouldHurtAChild he tries to hunt a young boy]] ([[FalseFriend by befriending and playing with him first]]) and later fools Agent J as well, chasing them both through a forest. This sadistic monster is definitely one of the nastiest [[MonsterOfTheWeek one-time villains]] in the series.

* The Nrak from The Bad Seed Syndrome. They are a bunch of tiny spores that spread everywhere, and infect people, transforming into additions to their hive mind.
* [[BigBad Agent]] [[KnightOfCerebus Alpha]], a renegade MIB officer who decided that he wanted to become the ultimate life-form by [[AppendageAssimilation hacking off alien limbs]] and [[OrganTheft ripping out their organs]] to graft to himself. He's basically a ''serial killer'' with all sorts of alien powers... scary in itself, before you see what he really looks like...

* The Nrak from The Bad Seed Syndrome. They are a bunch of tiny spores that spread everywhere, and infect people, transforming into additions to their hive mind.
* [[BigBad Agent]] [[KnightOfCerebus Alpha]], a renegade MIB officer who decided that he wanted to become the ultimate life-form by [[AppendageAssimilation hacking off alien limbs]] and [[OrganTheft ripping out their organs]] to graft to himself. He's basically a ''serial killer'' with all sorts of alien powers... scary in itself, before you see what he really looks like...

For a mostly light-hearted SaturdayMorningCartoon, [[WesternAnimation/MenInBlackTheSeries this show]] (based on [[Film/MenInBlack the movie]] of the same name) has more than its fair share of frightening alien monsters and villains.

* During the episode "The Buzzard Syndrome" which introduces [[BountyHunter Buzzard]], there's also the creature known as [[KillerRabbit Z-Ron]]. While Buzzard himself is rather creepy (being [[LeanAndMean extremely tall]], pale-skinned, [[EvilSoundsDeep deep-voiced]], wears a black coat to disguise his inhuman body) and proves that he's ''not'' a good guy (he tries to kill Agent K to keep him from interfering with Buzzard's bounty-hunt), his target turns out to be ''much'' worse. Z-Ron is [[spoiler:a (literally) predatory, savage, vicious SerialKiller who travels around space to kill and eat other sapient aliens; he initially resembles a [[CuteIsEvil "harmless" teddy bear]] to lure his victims into a false sense of security before [[OneWingedAngel turning into a hideous monster]] to attack them. His spaceship is filled with ''about a dozen different alien skeletons'', and decides to add humans to his menu -- [[WouldHurtAChild he tries to hunt a young boy]] ([[FalseFriend by befriending and playing with him first]]) and later fools Agent J as well, chasing them both through a forest.]] This sadistic monster is definitely one of the nastiest [[MonsterOfTheWeek one-time villains]] in the series.

* [[AliensAreBastards Vangus]], the co-antagonist of the two-part "[[GrandFinale The Endgame Syndrome]]", can easily match Alpha in terms of [[KnightOfCerebus vileness]] (if not even more so). Vangus is an Ixion commander who leads an [[AlienInvasion invasion of Earth]] in order to steal all oil from the planet. When the Earthlings successfully counter-attack with the help of some alien allies, [[spoiler:he decides to launch a missile that would [[KillAllHumans destroy everyone on the planet]] while saving the petroleum for himself, ''effectively screwing over Alpha'' (who intended to enslave any surviving humans). Although his evil plans are fortunately thwarted, [[KarmaHoudini Vangus escapes unharmed]] [[FridgeHorror in the end]].]]

* [[AliensAreBastards Vangus]], the co-antagonist of the two-part "[[GrandFinale The Endgame Syndrome]]", can easily match Alpha in terms of [[KnightOfCerebus vileness]] (if not even more so). Vangus is an Ixion commander who leads an [[AlienInvasion invasion of Earth]] in order to steal all oil from the planet. When the Earthlings successfully counter-attack with the help of some alien allies, [[spoiler:he decides to launch a missile that would [[OmnicidalManiac eliminate everyone and everything on the planet]] while saving the petroleum for himself, ''effectively screwing over Alpha'' (who intended to enslave any surviving humans). Even though all his plans were thwarted, [[KarmaHoudini Vangus escapes unharmed]] [[FridgeHorror in the end]].]]

** There's also what Forbus does to Agent K; he grabs hold of him and establishes a PsychicLink, which forces K to feel every sensation (both mental and physical) that Forbus feels as well. Whenever Forbus is injured, Kay feels the same pain, and vice versa. Kay is also [[MindRape sharing Forbus' warped emotions and thoughts]], [[HeelFaceBrainwashing until he turns evil and starts fighting Jay and Elle]].
* [[BigBad Agent]] [[KnightOfCerebus Alpha]], a renegade MIB officer who decided that he wanted to become the ultimate lifeform by [[AppendageAssimilation hacking off alien limbs]] and [[OrganTheft ripping out their organs]] to graft to himself. He's basically a ''serial killer'' with all sorts of alien powers... scary in itself, before you see what [[BodyHorror he really looks like]]...
** Even worse, he's a recurring villain, and a big contender for the series' BigBad. So of course, he is still running around harvesting organs. Each subsequent appearance [[HybridMonster he becomes more and more inhuman in appearance, until he looks absolutely nothing like he did in his first appearance, with the only thing left of him being his brain]].

* The Skraaldians from the pilot episode ("The Long Goodbye Syndrome") end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as a target of revenge for the entire race due to being a psychically-linked HiveMind. Worse, they can hide in the bodies of other aliens as parasites and [[ChestBurster burst from their chests]] to get to their victim, and masquerade as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing to get stung by one, swelling up and turning the color of rotten eggplant for a week, just to avoid their wrath. As Kay describes to Agent J after he killed one of them:

* During the episode "The Buzzard Syndrome" which introduces [[BountyHunter Buzzard]], there's also the creature known as [[KillerRabbit Z-Ron]]. While Buzzard himself is rather creepy ([[LeanAndMean extremely tall]], pale-skinned, [[EvilSoundsDeep deep-voiced]], wears a black coat to disguise his inhuman body) and proves that he's ''not'' a good guy (he tries to kill Agent K to keep him from interfering with Buzzard's bounty-hunt), his target turns out to be ''much'' worse. Z-Ron is [[spoiler:a (literally) predatory SerialKiller who travels around space to kill and eat other aliens; he initially resembles a [[CuteIsEvil "harmless" teddy bear]] to lure his victims into false security before [[OneWingedAngel turning into a hideous monster]] to attack them. His spaceship is filled with ''about a dozen different alien skeletons'', and decides to add humans to his menu -- [[WouldHurtAChild he tries to hunt a young boy]] ([[FalseFriend by befriending and playing with him first]]) and later fools Agent J as well, chasing them both through a forest.]] This sadistic monster is definitely one of the nastiest [[MonsterOfTheWeek one-time villains]] in the series.
* The antagonist of "The Psychic Link Syndrome" is Forbus, a mentally disturbed alien of the Alcidian race. Considered to be weird and socially reclusive even by his own species, he has an [[BerserkButton irrational phobia of cameras]]. Several unlucky humans who try to take photos or films of him find out the hard way about pissing off this guy, who decides to attack them and [[LifeDrinker drains them of vital bodily fluids]] (his first victim turns so emaciated and shriveled-up that he resembles a corpse). Though fortunately, none of those humans died and they later fully recovered in the MIB hospital.
** There's also what Forbus does to Agent K; he grabs hold of him and establishes a PsychicLink, which forces K to feel every sensation (both mental and physical) that Forbus feels as well. Whenever Forbus is injured, Kay feels the same pain, and vice versa. Kay is also sharing Forbus' warped emotions and thoughts, until Kay turns evil and starts fighting Jay and Elle.
* [[BigBad Agent]] [[KnightOfCerebus Alpha]], a renegade MIB officer who decided that he wanted to become the ultimate lifeform by [[AppendageAssimilation hacking off alien limbs]] and [[OrganTheft ripping out their organs]] to graft to himself. He's basically a ''serial killer'' with all sorts of alien powers... scary in itself, before you see what he [[BodyHorror really looks like]]...
** Even worse, he's a recurring villain, and a big contender for the series' BigBad. So of course, he is still running around harvesting organs. Each subsequent appearance [[BodyHorror he becomes more and more inhuman in appearance, until he looks absolutely nothing like he did in his first appearance, with the only thing left of him being his brain]].
** There's also the fact of Alpha having once been Agent K's partner and mentor. Kay [[EvilFormerFriend trusted him as a dear friend]], before Alpha eventually betrayed the Men in Black and even his own species (he was secretly collaborating with Vangus and the Ixions for a cancelled invasion of Earth). It's no wonder why Kay is so jaded and reserved most of the time.

* The Skraaldians from the pilot episode ("The Long Goodbye Syndrome") end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as a target of revenge for the entire race due to being a psychically-linked HiveMind. Worse, they can hide in the body of other aliens as parasites and [[ChestBurster burst from their chests]] to get to their victim, and masquerade as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing to get stung by one, swelling up and turning the color of rotten eggplant for a week, just to avoid their wrath. As Kay describes to Agent J after he killed one of them:

* The Skraaldians from the pilot episode ("The Long Goodbye Syndrome") end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as a target of revenge for the entire race due to being a psychically-linked HiveMind. Worse, they can hide in the body of other aliens as parasites and [[ChestBurster burst from their chests]] to get to their victim, and masquerade as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing get stung by one and swell up and turn the color of rotten eggplant for a week to avoid their wrath. As Kay describes to Agent J after he killed one of them:

* The Skraaldians from the pilot episode ("The Long Goodbye Syndrome") end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as a target of revenge for the entire race due the race being a psychically-linked HiveMind. Worse off, they can hide in the body of other aliens as parasites and [[ChestBurster burst from their chests]] to get to their victim, and masquerade as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing get stung by one and swell up and turn the color of rotten eggplant for a week to avoid their wrath. As Kay describes to Agent J after he killed one of them:

* Agent Alpha, a renegade MIB officer who decided that he wanted to become the ultimate lifeform by [[AppendageAssimilation hacking off alien limbs]] and [[OrganTheft ripping out their organs]] to graft to himself. He's basically a ''serial killer'' with all sorts of alien powers... scary in itself, before you see what he [[BodyHorror really looks like]]...
** Even worse, he's a recurring villain, and a big contender for the series' BigBad. So of course, he is still running around harvesting organs. Each subsequent appearance [[BodyHorror he becomes more and more inhuman in appearance, until he looks absolutely nothing like he did in his first appearance, with the only thing left of him being his brain.]]
* The Skraaldians from ''The Long Goodbye Syndrome'' end up being ParanoiaFuel UpToEleven. They're a shelled slug-like race that comes to Earth to multiply, as they like the warm climate in the sewers. However, if any single one of them is killed, the victim will vomit on the killer. The vomit then permanently marks the killer down to their DNA as a target of revenge for the entire race due the race being a psychically linked HiveMind. Worse off, they can hide in the body of other aliens as parasite and burst from their chests like Chestbursters from "Alien" to get to their victim, and masquerade as other species as something as innocent as a human hot dog vendor before they strike. If you kill two or more, they will slowly put you in a large vat of soup at temperatures of 3000 to 4000 degrees to melt. They're so bad that Kay was willing get stung by one and swell up and turn the color of rotten eggplant for a week to avoid their wrath. As Kay describes to Agent J after he killed one of them:
-->'''Kay:''' Skraaldians possess a hive mentality. They're psychically linked. They saw what you did. They know what you look like. They know where you live. All of them.... Listen, Slick. This is a whole planet of dudes dedicated to your demise. Four billion assassins locked on to your DNA, thinking about you every three seconds.
** Kay managed to get Agent J out of the death hit using an Arquillian robot suit decoy who owed him a favor, but if he hadn't J would have been a dead man for certain.