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** ''WesternAnimation/TransformersAnimated'' has all red-eyed (or in the case of Soundwave, red-''[[CoolShades sunglassed]]'') Decepticons like the original cartoon, with the exception of the nominally-a-Decepticon Swindle, who has purple eyes. However, Sari Sumdac, a ''human child'', also appears to have red eyes. [[spoiler:They turned [[https://static.tvtropes.org/pmwiki/pub/images/vlcsnap-488331.jpg blue]] after she [[SuperMode "upgraded" herself.]]]] Also, in ''Animated'', Wreck-Gar's eyes turn red when he threatens to destroy Detroit as a reference to ''WesternAnimation/TransformersTheMovie'' and his G1 counterpart's toy commercial. An interesting example occurs in Wasp. Originally, he had blue eyes, but after his stay in prison (and subsequent madness and desire to turn Bumblebee into iron filings), they become purple. And what color do you get when you mix red and blue?
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** ''WesternAnimation/TransformersAnimated'' has all red-eyed (or in the case of Soundwave, red-''[[CoolShades sunglassed]]'') Decepticons like the original cartoon, with the exception of the nominally-a-Decepticon Swindle, who has purple eyes. However, Sari Sumdac, a ''human child'', also appears to have red eyes. [[spoiler:They turned [[https://static.tvtropes.org/pmwiki/pub/images/vlcsnap-488331.jpg blue]] after she [[SuperMode "upgraded" herself.]]]] Also, in ''Animated'', Wreck-Gar's eyes turn red when he threatens to destroy Detroit as a reference to ''WesternAnimation/TransformersTheMovie'' ''WesternAnimation/TheTransformersTheMovie'' and his G1 counterpart's toy commercial. An interesting example occurs in Wasp. Originally, he had blue eyes, but after his stay in prison (and subsequent madness and desire to turn Bumblebee into iron filings), they become purple. And what color do you get when you mix red and blue?
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* ''WesternAnimation/XMenTheAnimatedSeries'':
** As in the comics, the Sentinels sport glowing red eyes.
** Apocalypse, both before and after the ArtShift sees this in play. Pre-Art Shift, his eyes has red sclerae with yellow irises. After the Art Shift, his irises were now red, whereas the sclerae were subject to BlackEyesOfEvil.
** As in the comics, the Sentinels sport glowing red eyes.
** Apocalypse, both before and after the ArtShift sees this in play. Pre-Art Shift, his eyes has red sclerae with yellow irises. After the Art Shift, his irises were now red, whereas the sclerae were subject to BlackEyesOfEvil.
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** Pops up a few times in ''WesternAnimation/BeastWars''', despite bots like Rattrap and Rhinox just normally having red optics, to warn you things are about to get real. When Megatron becomes a transmetal the first you see of him are his glowing red eyes against a silhouette, Silverbolt's eyes are normally gold but when Blackarachnia was killed and he uttered Tarantula's name in a vengeful manner [[BewareTheNiceOnes they]] [[RoaringRampageOfRevenge turned]] [[NightmareFuel red]], and most notably when Rhinox is reprogrammed as a Predacon his normally wise red eyes glow blood red for ''[[VilerNewVillain very good reason]].''
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** Pops up a few times in ''WesternAnimation/BeastWars''', ''WesternAnimation/BeastWars'', despite bots like Rattrap and Rhinox just normally having red optics, to warn you things are about to get real. When Megatron becomes a transmetal the first you see of him are his glowing red eyes against a silhouette, Silverbolt's eyes are normally gold but when Blackarachnia was killed and he uttered Tarantula's name in a vengeful manner [[BewareTheNiceOnes they]] [[RoaringRampageOfRevenge turned]] [[NightmareFuel red]], and most notably when Rhinox is reprogrammed as a Predacon his normally wise red eyes glow blood red for ''[[VilerNewVillain very good reason]].''
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** Parodied when AGIMUS tries to make himself appear reformed by changing his light colors from red to [[BlueIsHeroic blue.]] When he switches back, Tendi says that proves he's a monster. [[spoiler: When he does eventually decide to reform, the light changes back permanently.]]
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* ComicBook/TheJoker's ''WesternAnimation/BatmanBeyondReturnOfTheJoker'' design (also used for ''WesternAnimation/StaticShock'' and ''WesternAnimation/JusticeLeague'') also has red pupils. The red eyes on the latter-day Franchise/DCAnimatedUniverse design, along with the slicked-back hair sported by the Future Joker design in ''Return of the Joker'', were inspired by the novel's descriptions of Hannibal Lecter.
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* ComicBook/TheJoker's The Joker's ''WesternAnimation/BatmanBeyondReturnOfTheJoker'' design (also used for ''WesternAnimation/StaticShock'' and ''WesternAnimation/JusticeLeague'') also has red pupils. The red eyes on the latter-day Franchise/DCAnimatedUniverse design, along with the slicked-back hair sported by the Future Joker design in ''Return of the Joker'', were inspired by the novel's descriptions of Hannibal Lecter.
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* ''WesternAnimation/TheBatman''[='=]s version of ComicBook/TheJoker has nearly completely red eyes (but yellow pupils).
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* ''WesternAnimation/TheBatman''[='=]s ''WesternAnimation/TheBatman'''s version of ComicBook/TheJoker the Joker has nearly completely red eyes (but yellow pupils).
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* ''WesternAnimation/TheHollow'': The devil dogs have glowing eyes that have a reddish tint.
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* ''WesternAnimation/HazbinHotel'':
** Alastor the Radio Demon has bright red irises against blood red sclera, and they glow red when he goes into his GameFace. He's also one of the most powerful and notoriously evil demons in Hell.
** Cherri Bomb has one large red cyclops eye and is a violent psychopathic anarchist.
** Charlie's GameFace comes complete with hellish red eyes, a sign that no matter how sweet and perky she is, she's still the ''princess of Hell''.
* ''WesternAnimation/TheHollow'': The devil dogs have glowing eyes that have a reddish tint.
** Alastor the Radio Demon has bright red irises against blood red sclera, and they glow red when he goes into his GameFace. He's also one of the most powerful and notoriously evil demons in Hell.
** Cherri Bomb has one large red cyclops eye and is a violent psychopathic anarchist.
** Charlie's GameFace comes complete with hellish red eyes, a sign that no matter how sweet and perky she is, she's still the ''princess of Hell''.
* ''WesternAnimation/TheHollow'': The devil dogs have glowing eyes that have a reddish tint.
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* ''WesternAnimation/MyGoldfishIsEvil'': Admiral Bubbles has dark red pupils, underlining his evilness.
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** "The Robot Spy". The titular opponent - which was sent by the DiabolicalMastermind Doctor Zin - has one large red eye.
* Played with in ''WesternAnimation/TheLegendOfKorra'': The [[StatuesqueStunner imposing]] and [[TheBrute scary]] [[BombThrowingAnarchists Red Lotus]] [[HavingABlast combustionbender]] [[ColdSniper P'Li]] has eyes of [[DownplayedTrope an unusual shade of russet]]—which is [[JustifiedTrope still in keeping with the usual theme]] of [[PlayingWithFire firebenders]] having [[ElementalEyeColors gold or brown eyes]]—and a ''bright scarlet'' one [[PowerTattoo tattooed]] on her [[ThirdEye forehead]].
* Played with in ''WesternAnimation/TheLegendOfKorra'': The [[StatuesqueStunner imposing]] and [[TheBrute scary]] [[BombThrowingAnarchists Red Lotus]] [[HavingABlast combustionbender]] [[ColdSniper P'Li]] has eyes of [[DownplayedTrope an unusual shade of russet]]—which is [[JustifiedTrope still in keeping with the usual theme]] of [[PlayingWithFire firebenders]] having [[ElementalEyeColors gold or brown eyes]]—and a ''bright scarlet'' one [[PowerTattoo tattooed]] on her [[ThirdEye forehead]].
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** "The Robot Spy". The titular opponent - -- which was sent by the DiabolicalMastermind Doctor Zin - -- has one large red eye.
*Played with in ''WesternAnimation/TheLegendOfKorra'': Played with. The [[StatuesqueStunner imposing]] and [[TheBrute scary]] [[BombThrowingAnarchists Red Lotus]] [[HavingABlast combustionbender]] [[ColdSniper P'Li]] has eyes of [[DownplayedTrope an unusual shade of russet]]—which is [[JustifiedTrope still in keeping with the usual theme]] of [[PlayingWithFire firebenders]] having [[ElementalEyeColors gold or brown eyes]]—and a ''bright scarlet'' one [[PowerTattoo tattooed]] on her [[ThirdEye forehead]].
*
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* The Biskit twins in ''WesternAnimation/LittlestPetShop2012'' have reddish eyes, though they're not so much evil as they are sheltered and distant from those around them.
* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five chaotic musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Discord's eyes are yellow with red pupils, and he used to be a villain.
** Fuzzy Legs the spider has solid red eyes, as part of his character's parody and subversion of stock portrayals of monstrous spiders.
** "[[Recap/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed Luna Eclipsed]]": The spiders created by Luna's spell have solid red eyes, as part of their exaggerated monstrous appearance.
** "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]": The [[ArtifactOfDoom Alicorn Amulet]] makes the wearer's eyes go red. Trixie, who showcases the effect, becomes drunk with power and starts acting outright like a tyrant, as opposed to her moderate {{Jerkass}} tendencies.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E6PowerPonies Power Ponies]]": Fluttershy's eyes turn red when a firefly was flicked out of the crosshairs of the weapon as part of her HulkingOut.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E7Bats Bats!]]": Fluttershy gets red eyes when she's turned into a [[OurVampiresAreDifferent vampire]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]": Among the Tantabus' dream monsters, Monster Angel Bunny, the flying and some of the living houses have red eyes with yellow pupils.
** "[[Recap/MyLittlePonyFriendshipIsMagicS6E25ToWhereAndBackAgainPart1 To Where and Back Again: Part 1]]": Discord's pupils literally turn to fire for a moment when he learns the Changelings have captured [[MoralityPet Fluttershy]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS7E2AllBottledUp All Bottled Up]]": The ponies affected by the inadvertent release of Starlight's [[HatePlague bottled anger]] have glowing red eyes.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E12MarksForEffort Marks for Effort]]": [[spoiler:Cozy Glow]]'s red irises are the first cue that she is actually a manipulative villain, which isn't shown until several episodes later.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E22WhatLiesBeneath What Lies Beneath]]": The spiders' eyes glow bloody red, strengthening Yona's original terror of them.
* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five chaotic musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Discord's eyes are yellow with red pupils, and he used to be a villain.
** Fuzzy Legs the spider has solid red eyes, as part of his character's parody and subversion of stock portrayals of monstrous spiders.
** "[[Recap/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed Luna Eclipsed]]": The spiders created by Luna's spell have solid red eyes, as part of their exaggerated monstrous appearance.
** "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]": The [[ArtifactOfDoom Alicorn Amulet]] makes the wearer's eyes go red. Trixie, who showcases the effect, becomes drunk with power and starts acting outright like a tyrant, as opposed to her moderate {{Jerkass}} tendencies.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E6PowerPonies Power Ponies]]": Fluttershy's eyes turn red when a firefly was flicked out of the crosshairs of the weapon as part of her HulkingOut.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E7Bats Bats!]]": Fluttershy gets red eyes when she's turned into a [[OurVampiresAreDifferent vampire]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]": Among the Tantabus' dream monsters, Monster Angel Bunny, the flying and some of the living houses have red eyes with yellow pupils.
** "[[Recap/MyLittlePonyFriendshipIsMagicS6E25ToWhereAndBackAgainPart1 To Where and Back Again: Part 1]]": Discord's pupils literally turn to fire for a moment when he learns the Changelings have captured [[MoralityPet Fluttershy]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS7E2AllBottledUp All Bottled Up]]": The ponies affected by the inadvertent release of Starlight's [[HatePlague bottled anger]] have glowing red eyes.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E12MarksForEffort Marks for Effort]]": [[spoiler:Cozy Glow]]'s red irises are the first cue that she is actually a manipulative villain, which isn't shown until several episodes later.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E22WhatLiesBeneath What Lies Beneath]]": The spiders' eyes glow bloody red, strengthening Yona's original terror of them.
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* ''WesternAnimation/LittlestPetShop2012'': The Biskit twins in ''WesternAnimation/LittlestPetShop2012'' have reddish eyes, though they're not so much evil as they are sheltered and distant from those around them.
* ''WesternAnimation/{{Metalocalypse}}'': Dick Knubbler's robotic eyes turn red when he gets pissedoff in ''WesternAnimation/{{Metalocalypse}}''.off. Not so much "evil" as "{{Jerkass}}", but when one works for five chaotic musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
* ''Franchise/MyLittlePony'':
** ''WesternAnimation/MyLittlePonyAndFriends'': Grogar, the SorcerousOverlord villain of "The Return of Tambelon", has solid blood-red eyes without visible sclerae, irises or pupils.
** ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** *** Discord's eyes are yellow with red pupils, and he used to be a villain.
** *** Fuzzy Legs the spider has solid red eyes, as part of his character's parody and subversion of stock portrayals of monstrous spiders.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed Luna Eclipsed]]": The spiders created by Luna's spell have solid red eyes, as part of their exaggerated monstrous appearance.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]": The [[ArtifactOfDoom Alicorn Amulet]] makes the wearer's eyes go red. Trixie, who showcases the effect, becomes drunk with power and starts acting outright like a tyrant, as opposed to her moderate {{Jerkass}} tendencies.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS4E6PowerPonies Power Ponies]]": Fluttershy's eyes turn red when a firefly was flicked out of the crosshairs of the weapon as part of her HulkingOut.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS4E7Bats Bats!]]": Fluttershy gets red eyes when she's turned into a [[OurVampiresAreDifferent vampire]].
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]": Among the Tantabus' dream monsters, Monster Angel Bunny, the flying and some of the living houses have red eyes with yellow pupils.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS6E25ToWhereAndBackAgainPart1 To Where and Back Again: Part 1]]": Discord's pupils literally turn to fire for a moment when he learns the Changelings have captured [[MoralityPet Fluttershy]].
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS7E2AllBottledUp All Bottled Up]]": The ponies affected by the inadvertent release of Starlight's [[HatePlague bottled anger]] have glowing red eyes.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS8E12MarksForEffort Marks for Effort]]": [[spoiler:Cozy Glow]]'s red irises are the first cue that she is actually a manipulative villain, which isn't shown until several episodes later.
** *** "[[Recap/MyLittlePonyFriendshipIsMagicS8E22WhatLiesBeneath What Lies Beneath]]": The spiders' eyes glow bloody red, strengthening Yona's original terror of them.
* ''WesternAnimation/{{Metalocalypse}}'': Dick Knubbler's robotic eyes turn red when he gets pissed
* ''Franchise/MyLittlePony'':
** ''WesternAnimation/MyLittlePonyAndFriends'': Grogar, the SorcerousOverlord villain of "The Return of Tambelon", has solid blood-red eyes without visible sclerae, irises or pupils.
** ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
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* The first season of ''WesternAnimation/PoundPuppies1980s'' featured a villain named Captain Slaughter in some episodes. All we could see of his shadow-obscured face was a pair of sinister red eyes.
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* ''WesternAnimation/PoundPuppies1980s'': The first season of ''WesternAnimation/PoundPuppies1980s'' featured features a villain named Captain Slaughter in some episodes. All we could see that is seen of his shadow-obscured face was is a pair of sinister red eyes.
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* Though a number of ghosts from ''WesternAnimation/TheRealGhostbusters'' have these, probably the most notable example is "The Umpire" from "Night Game". While for the most part a neutral judge and even a ReasonableAuthorityFigure, his eyes glow ''bright red'' once and only once: when Peter so much as implies [[BerserkButton a human soul isn't the most valuable thing in existence]]. [[OOCIsSeriousBusiness Peter immediately takes it back]].
* ''WesternAnimation/SamuraiJack'' has Mad Jack, Aku's embodiment of Jack's own dark side.
* ''WesternAnimation/SamuraiJack'' has Mad Jack, Aku's embodiment of Jack's own dark side.
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* Though ''WesternAnimation/TheRealGhostbusters'': Although a number of ghosts from ''WesternAnimation/TheRealGhostbusters'' have these, probably the most notable example is "The Umpire" from "Night Game". While for the most part a neutral judge and even a ReasonableAuthorityFigure, his eyes glow ''bright red'' bright red once and only once: when Peter so much as implies that [[BerserkButton a human soul isn't the most valuable thing in existence]]. [[OOCIsSeriousBusiness Peter immediately takes it back]].
* ''WesternAnimation/SamuraiJack'' has %%* ''WesternAnimation/SamuraiJack'': Mad Jack, Aku's embodiment of Jack's own dark side.
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* In ''WesternAnimation/{{Slugterra}}'', the eyes of mecha-beasts turn red when they are ghouled; as seen in "Mecha Mutiny".
* Dr. Julian Robotnik from ''WesternAnimation/SonicTheHedgehogSatAM'' has a pair of red cybernetic optics that shine like hellish spotlights in the dark.
* Squidward, Plankton, and Man Ray from ''WesternAnimation/SpongeBobSquarePants''. Averted with Gary. Ironically, the former two are now the most sympathetic characters on the entire show.
* Dr. Julian Robotnik from ''WesternAnimation/SonicTheHedgehogSatAM'' has a pair of red cybernetic optics that shine like hellish spotlights in the dark.
* Squidward, Plankton, and Man Ray from ''WesternAnimation/SpongeBobSquarePants''. Averted with Gary. Ironically, the former two are now the most sympathetic characters on the entire show.
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* In ''WesternAnimation/{{Slugterra}}'', the ''WesternAnimation/{{Slugterra}}'': The eyes of mecha-beasts turn red when they are ghouled; ghouled, as seen in "Mecha Mutiny".
* ''WesternAnimation/SonicTheHedgehogSatAM'': Dr. Julian Robotnikfrom ''WesternAnimation/SonicTheHedgehogSatAM'' has a pair of red cybernetic optics that shine like hellish spotlights in the dark.
* %%* ''WesternAnimation/SpongeBobSquarePants'': Squidward, Plankton, and Man Ray from ''WesternAnimation/SpongeBobSquarePants''.Ray. Averted with Gary. Ironically, the former two are now the most sympathetic characters on the entire show.%%ZCE, self-contradictory writing.
* ''WesternAnimation/SonicTheHedgehogSatAM'': Dr. Julian Robotnik
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* ''WesternAnimation/DorgVanDango'': Yooki does this when she's angry or in the process of scaring someone, complete with [[EvilSoundsDeep evil voice]].
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* On ''WesternAnimation/StarWarsRebels'', [[KidHero Ezra Bridger's]] eyes take on a reddish tinge when he opens the Sith holocron, signifying the growing influence of TheDarkSide on him.
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* On ''WesternAnimation/StarWarsRebels'', ''WesternAnimation/StarWarsRebels'':
** [[KidHero Ezra Bridger's]] eyes take on a reddish tinge when he opens the Sith holocron, signifying the growing influence of TheDarkSide onhim.him.
** Grand Admiral Thrawn has red eyes and is one of the most cunning, ruthless, and dangerous enemies of the Rebels.
** [[KidHero Ezra Bridger's]] eyes take on a reddish tinge when he opens the Sith holocron, signifying the growing influence of TheDarkSide on
** Grand Admiral Thrawn has red eyes and is one of the most cunning, ruthless, and dangerous enemies of the Rebels.
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Examples of RedEyesTakeWarning in WesternAnimation.
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--->'''Vampirified Numbuh Three:''' [[spoiler:Isn't that right, Big-Bottom Vampire Monkey?]]
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** The [[OurWerebeastsAreDifferent Were-Dogs]] have this, too.
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** The [[OurWerebeastsAreDifferent Were-Dogs]] have this, too.
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** The [[OurWerebeastsAreDifferent Were-Dogs]] have this, too.
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** In "Operation: L.O.C.K.D.O.W.N.", [[spoiler:Numbuh 3's Big-Bottom Rainbow Monkey Doll gets these as part of its EvilCostumeSwitch into a [[ComedicSpanking Spank-Happy]] [[OurVampiresAreDifferent Vampire]], replacing its classic Mickey Mouse eyes, when it is revealed that Count Spankulot turned Numbuh 1 into a vampire, and Numbuh 1 would go on to spread his vampirism to the others. Then again, it's a ''stuffed animal'', so it can't really attack.]]
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** In "Operation: L.O.C.K.D.O.W.N.", [[spoiler:Numbuh 3's Big-Bottom Rainbow Monkey Doll gets these as part of its EvilCostumeSwitch into a [[ComedicSpanking Spank-Happy]] [[OurVampiresAreDifferent Vampire]], replacing its classic Mickey Mouse eyes, when it is revealed that Count Spankulot turned the operatives were transformed into vampires and were about to spank Numbuh 1 into a vampire, and Numbuh 1 would go on to spread his vampirism to 5 for using the others.Quadruple Emergency Bypass Code to lift the lockdown. Then again, it's a ''stuffed animal'', so it can't really attack.]]
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* ''CodenameKidsNextDoor'':
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* ''CodenameKidsNextDoor'':''WesternAnimation/CodenameKidsNextDoor'':
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** In "Operation: P.R.E.S.I.D.E.N.T.", the Delightful Children from Down the Lane's robotic clone of the [[spoiler:former]] Fourth Grade President has these, and always used when it is about to attack its enemies.
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** In "Operation: P.R.E.S.I.D.E.N.T.", the Delightful Children from Down the Lane's robotic clone of James Nixon [=McGarfield=], the [[spoiler:former]] Fourth Grade President President, has these, and always used when it is about to attack its enemies.
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* ''CodenameKidsNextDoor'':
** In "Operation: L.O.C.K.D.O.W.N.", [[spoiler:Numbuh 3's Big-Bottom Rainbow Monkey Doll gets these as part of its EvilCostumeSwitch into a [[ComedicSpanking Spank-Happy]] [[OurVampiresAreDifferent Vampire]], replacing its classic Mickey Mouse eyes, when it is revealed that Count Spankulot turned Numbuh 1 into a vampire, and Numbuh 1 would go on to spread his vampirism to the others. Then again, it's a ''stuffed animal'', so it can't really attack.]]
** In "Operation: P.R.E.S.I.D.E.N.T.", the Delightful Children from Down the Lane's robotic clone of the [[spoiler:former]] Fourth Grade President has these, and always used when it is about to attack its enemies.
** In "Operation: L.O.C.K.D.O.W.N.", [[spoiler:Numbuh 3's Big-Bottom Rainbow Monkey Doll gets these as part of its EvilCostumeSwitch into a [[ComedicSpanking Spank-Happy]] [[OurVampiresAreDifferent Vampire]], replacing its classic Mickey Mouse eyes, when it is revealed that Count Spankulot turned Numbuh 1 into a vampire, and Numbuh 1 would go on to spread his vampirism to the others. Then again, it's a ''stuffed animal'', so it can't really attack.]]
** In "Operation: P.R.E.S.I.D.E.N.T.", the Delightful Children from Down the Lane's robotic clone of the [[spoiler:former]] Fourth Grade President has these, and always used when it is about to attack its enemies.
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* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five ChaoticNeutral musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
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* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five ChaoticNeutral chaotic musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
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* ''WesternAnimation/ThePowerpuffGirls1998'' (and its [[Anime/PowerpuffGirlsZ anime]] counterpart) gives us Brick of the [[ThePsychoRangers Rowdyruff Boys]]. True to this trope, Brick loves to [[ChaoticEvil cause destruction and hurt others]].
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* ''WesternAnimation/ThePowerpuffGirls1998'' (and its [[Anime/PowerpuffGirlsZ anime]] counterpart) gives us Brick of the [[ThePsychoRangers Rowdyruff Boys]]. True to this trope, Brick loves to [[ChaoticEvil cause destruction and hurt others]].others.
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* ''WesternAnimation/AaahhRealMonsters'': Before he transforms into his OneWingedAngel form, Ickis' eyes start turning red, complete with a sound effect that sounds like they're filling up with blood. To a lesser extent [[SadistTeacher The Gromble]], whenever he's '''''really''''' ticked off his eyes start turning red much in the same manner as Ickis' eyes before he looms.
* [[EvilPoacher The Huntsman]] from ''WesternAnimation/AmericanDragonJakeLong'' had completely red eyes in season 1, then later had normal eyes when the characters were all redesigned in season 2.
* ''WesternAnimation/AtomicBetty'':
** In an episode when RichBitch Penelope is cloned, the clone has red eyes. It is probably less evil than the original.
** [[CatsAreMean Koreena]], Betty's old rival turned villain, also has red eyes.
* ''WesternAnimation/TheBatman''[='=]s version of ComicBook/TheJoker has nearly completely red eyes (but yellow pupils).
* ComicBook/TheJoker's ''WesternAnimation/BatmanBeyondReturnOfTheJoker'' design (also used for ''WesternAnimation/StaticShock'' and ''WesternAnimation/JusticeLeague'') also has red pupils. The red eyes on the latter-day Franchise/DCAnimatedUniverse design, along with the slicked-back hair sported by the Future Joker design in ''Return of the Joker'', were inspired by the novel's descriptions of Hannibal Lecter.
* ''WesternAnimation/BatmanTheBraveAndTheBold'':
** The eyes of Ultra-Humanite's army of mind-controlled dinosaurs glow red in "Four Star Spectacular!"
** Inverted with the Blue Beetle, where when his eyes are red, he's friendly.
* WesternAnimation/BugsBunny cartoon ''Hyde and Hare''. When Dr. Jekyll turns into the evil Mr. Hyde his eyes turn red. After Bugs drinks the formula and turns into a giant green rabbit the same happens to him.
* ''WesternAnimation/BunsenIsABeast'': Amanda Killman has red outlines around her eyes to reflect her devilish nature.
* ''WesternAnimation/BuzzLightyearOfStarCommand'':
** The AffablyEvil Emperor Zurg.
** Also, XR had red eyes during his brief stint as villain NOS-4-A2's vampire slave.
** And NOS-4-A2 himself has red eyes.
* ''WesternAnimation/CaptainPlanetAndThePlaneteers'': In "The Conqueror", [[BigBad Zarm's]] eyes turn red whenever [[TheCorrupter he's manipulating]] the older Planeteers.
* In ''WesternAnimation/Castlevania2017'' the vampires that serve under {{Dracula}} have red eyes that's usually the [[https://vignette.wikia.nocookie.net/castlevania/images/8/8e/DraculaArmyVampireSoldiers.JPG/revision/latest/scale-to-width-down/444?cb=20181026212405 only things that can be seen under their hoods]], though it's not a genetic trait as other named vampires don't have red eyes e.g Carmilla who has IcyBlueEyes. Also Alucard, Dracula's son has SupernaturalGoldEyes to show he's a HalfHumanHybrid but Drac himself has the classic scarlet pupils and when he's enraged [[https://fsmedia.imgix.net/aa/a2/77/5b/1447/4adb/9aeb/e9394510f27d/dracula-in-netflixs-castlevania-animated-series.jpeg the whole sclera goes red]].
* On ''WesternAnimation/CodeMonkeys'', whenever a character gets really angry or psychotic, their pixel eyes will briefly become red.
* WesternAnimation/CountDuckula's demented cousin, a pyromaniac vamp who likes to dismember his victims. Also El Loco, the vicious bull Duckula has to fight.
* ''WesternAnimation/DannyPhantom'':
** Several of Danny Phantom's enemies have red eyes, including his arch-rival, Vlad Plasmius (whose eyes are blue in human form and completely red and pupil-less in ghost-form), and his [[FutureMeScaresMe sociopathic alternate-future self]], Dark Danny (AKA Dan Phantom). Red-eyed DungeonMaster Clockwork, on the other hand, despite being originally portrayed as a villain, is good-hearted but on the neutral side.
** Danny's own red eyes when under the control of Freakshow in "Control Freaks".
* In ''WesternAnimation/DarkwingDuck'' , [=DarkWarrior=] Duck has glowing red eyes (well, his mask does), and the screen fades around them in an extremely creepy scene transition.
* In the ''WesternAnimation/GadgetBoyAndHeather'' episode "Double, Double, Toil, and Dabble", Gadget Boy's EvilKnockoff Bad Gadget Boy had red eyes to distinguish him from the real Gadget Boy.
* [[PlayingWithATrope Played with]] on ''WesternAnimation/{{Gargoyles}};'' [[BigBad Demona]], the [[KillAllHumans evil]] gargoyle, has eyes that glow red when she's angry while our heroes' eyes glow white. However, it was later established that it was a sex-linked trait; [[AffirmativeActionGirl Angela]], a new heroic gargoyle in Season 2, also has red-glowing eyes, as do all other female gargoyles, while all male gargoyles have white-glowing eyes (except in the case of clones, where the eye-glow colors are gender-swapped). [[GoodIsNotSoft Still definitely a sign to take warning, though]].
%%* The Duke from ''WesternAnimation/{{Gawayn}}''.
* Odd variant: while Serpentor from ''WesternAnimation/GIJoeARealAmericanHero'' was always evil, his eyes briefly turned red when he held the battleax of UsefulNotes/VladTheImpaler, one of the many historical tyrants whose DNA he shared. This was presumably a hint that Vlad had really been a vampire in the show's universe and contact with one of his artifacts had evoked that trait in Serpentor.
* Trina Riffin from ''WesternAnimation/{{Grojband}}'' whenever she's writing in her diary in Anger or Fear mode.
* Skeletor, nemesis of He-Man from ''WesternAnimation/HeManAndTheMastersOfTheUniverse2002''. His eye (sockets) function as a literal warning, as little red lights start growing in them when he gets angry or excited in evil ways.
* ''WesternAnimation/TheHollow'': The devil dogs have glowing eyes that have a reddish tint.
* The Grinch in ''WesternAnimation/HowTheGrinchStoleChristmas'' has red pupils on yellow for most of the film. His eyes turn blue-on-white during his HeelFaceTurn, then switch back (by mistake?) for a few shots, then stay blue.
* In ''WesternAnimation/IvickVonSalzaTheLittleLumberjack'', whenever the yeti gets mad, his eyes turn red.
* In ''WesternAnimation/JackieChanAdventures'', the Shadowkhan and the Demon Sorcerer BigBadDuumvirate, among others, have red eyes. When Jade and later Valmont get possessed by the show's overall BigBad Shendu, their eyes turn red whenever HE'S in control of their body.
* ''WesternAnimation/JonnyQuest'' TOS episodes
** "Monster in the Monastery". The fake yeti (who are malicious enemy agents) have red eyes.
** "The Robot Spy". The titular opponent - which was sent by the DiabolicalMastermind Doctor Zin - has one large red eye.
* Played with in ''WesternAnimation/TheLegendOfKorra'': The [[StatuesqueStunner imposing]] and [[TheBrute scary]] [[BombThrowingAnarchists Red Lotus]] [[HavingABlast combustionbender]] [[ColdSniper P'Li]] has eyes of [[DownplayedTrope an unusual shade of russet]]—which is [[JustifiedTrope still in keeping with the usual theme]] of [[PlayingWithFire firebenders]] having [[ElementalEyeColors gold or brown eyes]]—and a ''bright scarlet'' one [[PowerTattoo tattooed]] on her [[ThirdEye forehead]].
** Played straight with Unalaq, whenever he enters the Avatar State, and in his Dark Avatar form.
* The Biskit twins in ''WesternAnimation/LittlestPetShop2012'' have reddish eyes, though they're not so much evil as they are sheltered and distant from those around them.
* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five ChaoticNeutral musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Discord's eyes are yellow with red pupils, and he used to be a villain.
** Fuzzy Legs the spider has solid red eyes, as part of his character's parody and subversion of stock portrayals of monstrous spiders.
** "[[Recap/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed Luna Eclipsed]]": The spiders created by Luna's spell have solid red eyes, as part of their exaggerated monstrous appearance.
** "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]": The [[ArtifactOfDoom Alicorn Amulet]] makes the wearer's eyes go red. Trixie, who showcases the effect, becomes drunk with power and starts acting outright like a tyrant, as opposed to her moderate {{Jerkass}} tendencies.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E6PowerPonies Power Ponies]]": Fluttershy's eyes turn red when a firefly was flicked out of the crosshairs of the weapon as part of her HulkingOut.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E7Bats Bats!]]": Fluttershy gets red eyes when she's turned into a [[OurVampiresAreDifferent vampire]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]": Among the Tantabus' dream monsters, Monster Angel Bunny, the flying and some of the living houses have red eyes with yellow pupils.
** "[[Recap/MyLittlePonyFriendshipIsMagicS6E25ToWhereAndBackAgainPart1 To Where and Back Again: Part 1]]": Discord's pupils literally turn to fire for a moment when he learns the Changelings have captured [[MoralityPet Fluttershy]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS7E2AllBottledUp All Bottled Up]]": The ponies affected by the inadvertent release of Starlight's [[HatePlague bottled anger]] have glowing red eyes.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E12MarksForEffort Marks for Effort]]": [[spoiler:Cozy Glow]]'s red irises are the first cue that she is actually a manipulative villain, which isn't shown until several episodes later.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E22WhatLiesBeneath What Lies Beneath]]": The spiders' eyes glow bloody red, strengthening Yona's original terror of them.
* ''WesternAnimation/TheNewAdventuresOfSuperman'': "The Japanese Sandman". The titular monster (who commits evil acts in return for a black pearl) has red eyes.
* ''WesternAnimation/{{Ninjago}}: Masters of Spinjitzu''. All the skeletons, Lord Garmadon and the Hypnobrai tribe have glowing red eyes.
* ''WesternAnimation/ThePenguinsOfMadagascar'':
** In "Dr. Blowhole's Revenge", Skipper activates a King Julien robot decoy.
--->'''Skipper''': Glowing red eyes. That's almost never good.\\
(''the robot explodes'')
** In "The Hoboken Surprise", all the animals are replaced with robots with red eyes.
* The first season of ''WesternAnimation/PoundPuppies1980s'' featured a villain named Captain Slaughter in some episodes. All we could see of his shadow-obscured face was a pair of sinister red eyes.
* ''WesternAnimation/ThePowerpuffGirls1998'' (and its [[Anime/PowerpuffGirlsZ anime]] counterpart) gives us Brick of the [[ThePsychoRangers Rowdyruff Boys]]. True to this trope, Brick loves to [[ChaoticEvil cause destruction and hurt others]].
** In the 1998 series' episode "Tough Love", the people put under HIM's mind control in his attempt to kill the girls sport red blank eyes, alongside an angry expression.
* Though a number of ghosts from ''WesternAnimation/TheRealGhostbusters'' have these, probably the most notable example is "The Umpire" from "Night Game". While for the most part a neutral judge and even a ReasonableAuthorityFigure, his eyes glow ''bright red'' once and only once: when Peter so much as implies [[BerserkButton a human soul isn't the most valuable thing in existence]]. [[OOCIsSeriousBusiness Peter immediately takes it back]].
* ''WesternAnimation/SamuraiJack'' has Mad Jack, Aku's embodiment of Jack's own dark side.
* ''Franchise/ScoobyDoo'':
** ''WesternAnimation/ScoobyDooWhereAreYou'' episode "A Gaggle of Galloping Ghosts". The [[UsefulNotes/{{Romani}} Gypsy]] FortuneTeller, who turns out to be the episode's {{villain|s}} in disguise, has red eyes.
** Some of the ghosts from the Chest of Demons that Scooby and Shaggy are tasked with recapturing after being tricked into releasing them in ''WesternAnimation/The13GhostsOfScoobyDoo'' have red eyes.
*** Maldor the Malevolent in "Scoobra Kadoobra" starts out with yellow eyes, but at one point his eyes turn red when he glares at Daphne. A bit later, his eyes stay red for the rest of the episode.
*** The Reflector Specter from "Reflections in a Ghoulish Eye" is a hideous red-eyed demon who hides in mirrors.
*** Marcella, who is recaptured by the gang in the episode "When You Witch Upon a Star", has red, pupil-less eyes.
** The evil clones of Mystery, Inc. in the ''WesternAnimation/WhatsNewScoobyDoo'' episode "A Scooby-Doo Valentine" have red eyes.
* ''WesternAnimation/SheRaAndThePrincessesOfPower'':
** Hordak's eyes are a flat red glow, without iris or pupil. He's the BigBad.
** When corrupted by a First One virus, Adora gains these [[SuperMode in her She-Ra form]]. Corrupted Adora is TheBerserker, and is generally best avoided; in She-Ra form, Adora can break rocks, and while corrupted, she has ''absolutely'' no goals beyond mindless bloodshed.
** Averted with Entrapta. While she has dark red eyes and wears a creepy, red-eyed welding mask, she's TrueNeutral and most of the damage she causes is in pursuit of [[ForScience learning something new]], as opposed to evil; indeed, she ends up as a TokenGoodTeammate to the Horde after her defection.
* In ''WesternAnimation/{{Slugterra}}'', the eyes of mecha-beasts turn red when they are ghouled; as seen in "Mecha Mutiny".
* Dr. Julian Robotnik from ''WesternAnimation/SonicTheHedgehogSatAM'' has a pair of red cybernetic optics that shine like hellish spotlights in the dark.
* Squidward, Plankton, and Man Ray from ''WesternAnimation/SpongeBobSquarePants''. Averted with Gary. Ironically, the former two are now the most sympathetic characters on the entire show.
* ''WesternAnimation/StarTrekLowerDecks'':
** It's revealed that the Tamarian expression for "Oh, crap!" is "Zinda, his eyes red!"
** Admiral Buenamigo's pet project, the fully-automated ''Texas''-class U.S.S. ''Aledo'', starts glowing red when [[spoiler:its corrupted A.I. causes it to turn on and kill Buenamigo before attacking other Starfleet assets]].
* ''WesternAnimation/StarWarsTheCloneWars'':
** Cad Bane is a Duros bounty hunter with red eyes. He's an extremely dangerous fighter and crack shot with a blaster, and he most certainly WouldHurtAChild in exchange for a paycheck.
** Season 3's Mortis trilogy has the Son, AnthropomorphicPersonification of TheDarkSide, combined with black sclera.
* On ''WesternAnimation/StarWarsRebels'', [[KidHero Ezra Bridger's]] eyes take on a reddish tinge when he opens the Sith holocron, signifying the growing influence of TheDarkSide on him.
* ''WesternAnimation/{{Superfriends}}'':
** The 1973 episode "Menace of the White Dwarf". The evil MadScientist Raven (who acts more like a {{Comic Book|s}} supervillain than any other opponent the Superfriends faced during this season), has red eyes.
** The evil Superman from the 1979 episode "[[MirrorUniverse Universe of Evil]]" has red eyes as well, and for bonus points, they're ringed in black, [[http://images2.wikia.nocookie.net/__cb20090623171754/superfriends/images/6/6a/EvilSuperman.png with freakin' huge demonic points]]. Evil!Batman and Evil!Robin also have red eyes in place of their good counterparts' [[MonochromaticEyes plain white eyes]].
* ''WesternAnimation/TeenTitans2003'':
** Trigon, [[SatanicArchetype very bad dude]] indeed.
** Brother Blood, BigBad of the third season, has eyes that glow red when he uses his PsychicPowers; in the fifth season, the mechanical eyes on the skull-"face" on the Brain's life-support pod also glow red when the Brain is interfacing with his computers or is just angry.
** Red Star's eyes are normally green, [[MonochromaticEyes lacking pupils or whites]]. When his uncontrollable and incredibly destructive radioactive powers start to activate, they glow red.
** Raven isn't evil and her eyes are normally a deep purple, but when she goes OneWingedAngel her eyes glow solid red. And suddenly there's ''four'' of them. [[spoiler: Makes sense since Trigon's her dad.]]
* Nearly all the Decepticons of the original ''Franchise/{{Transformers}}'' (notably the [[WesternAnimation/TheTransformers original cartoon]]) had red optics. Later versions had a bit more optical variety.
** The episode "Attack of the Autobots" had the BrainwashedAndCrazy Autobots' optics turn red, being restored to their normal blue when cured.
** ''WesternAnimation/TransformersAnimated'' has all red-eyed (or in the case of Soundwave, red-''[[CoolShades sunglassed]]'') Decepticons like the original cartoon, with the exception of the nominally-a-Decepticon Swindle, who has purple eyes. However, Sari Sumdac, a ''human child'', also appears to have red eyes. [[spoiler:They turned [[https://static.tvtropes.org/pmwiki/pub/images/vlcsnap-488331.jpg blue]] after she [[SuperMode "upgraded" herself.]]]] Also, in ''Animated'', Wreck-Gar's eyes turn red when he threatens to destroy Detroit as a reference to ''WesternAnimation/TransformersTheMovie'' and his G1 counterpart's toy commercial. An interesting example occurs in Wasp. Originally, he had blue eyes, but after his stay in prison (and subsequent madness and desire to turn Bumblebee into iron filings), they become purple. And what color do you get when you mix red and blue?
*** [[spoiler:The Autobots']] eyes also turned red when they were brainwashed by [[spoiler:Soundwave]] into being evil.
** Pops up a few times in ''WesternAnimation/BeastWars''', despite bots like Rattrap and Rhinox just normally having red optics, to warn you things are about to get real. When Megatron becomes a transmetal the first you see of him are his glowing red eyes against a silhouette, Silverbolt's eyes are normally gold but when Blackarachnia was killed and he uttered Tarantula's name in a vengeful manner [[BewareTheNiceOnes they]] [[RoaringRampageOfRevenge turned]] [[NightmareFuel red]], and most notably when Rhinox is reprogrammed as a Predacon his normally wise red eyes glow blood red for ''[[VilerNewVillain very good reason]].''
** [[DemonicPossession False Convoy]] in ''[[Manga/TransformersZone Transformers: Return of Convoy]]'' is distinguished from Optimus Prime by having red eyes instead of blue.
** ''[[ComicBook/TransformersShatteredGlass Shattered Glass]]'', of course, reverses this, with the Decepticons mostly having blue optics and the Autobots mostly having red ones. Though there are a fair number of green, yellow, and other oddball optic colors on both sides, and Heatwave strangely has red optics despite being a nice guy, even by his fellow Decepticons' standards. [[spoiler:Turns out, it's because he's not actually from the SG universe at all.]]
* In ''WesternAnimation/WinxClub'' , although Bloom is a friendly, easygoing and sweet girl most of the time, if you commit the mistake of pissing her off enough (and trust us, it's very hard to achieve it) you'll see LITERAL FLAMES coming from her eyes...
* In ''WesternAnimation/WhatIf2021'', the eyes of [[spoiler:Doctor Strange]] slowly turn to red as he absorbs more and more power from [[spoiler:all the extra-dimensional creatures he consumes]], along with an increasingly demonic appearance and unhinged behaviour.
----
* [[EvilPoacher The Huntsman]] from ''WesternAnimation/AmericanDragonJakeLong'' had completely red eyes in season 1, then later had normal eyes when the characters were all redesigned in season 2.
* ''WesternAnimation/AtomicBetty'':
** In an episode when RichBitch Penelope is cloned, the clone has red eyes. It is probably less evil than the original.
** [[CatsAreMean Koreena]], Betty's old rival turned villain, also has red eyes.
* ''WesternAnimation/TheBatman''[='=]s version of ComicBook/TheJoker has nearly completely red eyes (but yellow pupils).
* ComicBook/TheJoker's ''WesternAnimation/BatmanBeyondReturnOfTheJoker'' design (also used for ''WesternAnimation/StaticShock'' and ''WesternAnimation/JusticeLeague'') also has red pupils. The red eyes on the latter-day Franchise/DCAnimatedUniverse design, along with the slicked-back hair sported by the Future Joker design in ''Return of the Joker'', were inspired by the novel's descriptions of Hannibal Lecter.
* ''WesternAnimation/BatmanTheBraveAndTheBold'':
** The eyes of Ultra-Humanite's army of mind-controlled dinosaurs glow red in "Four Star Spectacular!"
** Inverted with the Blue Beetle, where when his eyes are red, he's friendly.
* WesternAnimation/BugsBunny cartoon ''Hyde and Hare''. When Dr. Jekyll turns into the evil Mr. Hyde his eyes turn red. After Bugs drinks the formula and turns into a giant green rabbit the same happens to him.
* ''WesternAnimation/BunsenIsABeast'': Amanda Killman has red outlines around her eyes to reflect her devilish nature.
* ''WesternAnimation/BuzzLightyearOfStarCommand'':
** The AffablyEvil Emperor Zurg.
** Also, XR had red eyes during his brief stint as villain NOS-4-A2's vampire slave.
** And NOS-4-A2 himself has red eyes.
* ''WesternAnimation/CaptainPlanetAndThePlaneteers'': In "The Conqueror", [[BigBad Zarm's]] eyes turn red whenever [[TheCorrupter he's manipulating]] the older Planeteers.
* In ''WesternAnimation/Castlevania2017'' the vampires that serve under {{Dracula}} have red eyes that's usually the [[https://vignette.wikia.nocookie.net/castlevania/images/8/8e/DraculaArmyVampireSoldiers.JPG/revision/latest/scale-to-width-down/444?cb=20181026212405 only things that can be seen under their hoods]], though it's not a genetic trait as other named vampires don't have red eyes e.g Carmilla who has IcyBlueEyes. Also Alucard, Dracula's son has SupernaturalGoldEyes to show he's a HalfHumanHybrid but Drac himself has the classic scarlet pupils and when he's enraged [[https://fsmedia.imgix.net/aa/a2/77/5b/1447/4adb/9aeb/e9394510f27d/dracula-in-netflixs-castlevania-animated-series.jpeg the whole sclera goes red]].
* On ''WesternAnimation/CodeMonkeys'', whenever a character gets really angry or psychotic, their pixel eyes will briefly become red.
* WesternAnimation/CountDuckula's demented cousin, a pyromaniac vamp who likes to dismember his victims. Also El Loco, the vicious bull Duckula has to fight.
* ''WesternAnimation/DannyPhantom'':
** Several of Danny Phantom's enemies have red eyes, including his arch-rival, Vlad Plasmius (whose eyes are blue in human form and completely red and pupil-less in ghost-form), and his [[FutureMeScaresMe sociopathic alternate-future self]], Dark Danny (AKA Dan Phantom). Red-eyed DungeonMaster Clockwork, on the other hand, despite being originally portrayed as a villain, is good-hearted but on the neutral side.
** Danny's own red eyes when under the control of Freakshow in "Control Freaks".
* In ''WesternAnimation/DarkwingDuck'' , [=DarkWarrior=] Duck has glowing red eyes (well, his mask does), and the screen fades around them in an extremely creepy scene transition.
* In the ''WesternAnimation/GadgetBoyAndHeather'' episode "Double, Double, Toil, and Dabble", Gadget Boy's EvilKnockoff Bad Gadget Boy had red eyes to distinguish him from the real Gadget Boy.
* [[PlayingWithATrope Played with]] on ''WesternAnimation/{{Gargoyles}};'' [[BigBad Demona]], the [[KillAllHumans evil]] gargoyle, has eyes that glow red when she's angry while our heroes' eyes glow white. However, it was later established that it was a sex-linked trait; [[AffirmativeActionGirl Angela]], a new heroic gargoyle in Season 2, also has red-glowing eyes, as do all other female gargoyles, while all male gargoyles have white-glowing eyes (except in the case of clones, where the eye-glow colors are gender-swapped). [[GoodIsNotSoft Still definitely a sign to take warning, though]].
%%* The Duke from ''WesternAnimation/{{Gawayn}}''.
* Odd variant: while Serpentor from ''WesternAnimation/GIJoeARealAmericanHero'' was always evil, his eyes briefly turned red when he held the battleax of UsefulNotes/VladTheImpaler, one of the many historical tyrants whose DNA he shared. This was presumably a hint that Vlad had really been a vampire in the show's universe and contact with one of his artifacts had evoked that trait in Serpentor.
* Trina Riffin from ''WesternAnimation/{{Grojband}}'' whenever she's writing in her diary in Anger or Fear mode.
* Skeletor, nemesis of He-Man from ''WesternAnimation/HeManAndTheMastersOfTheUniverse2002''. His eye (sockets) function as a literal warning, as little red lights start growing in them when he gets angry or excited in evil ways.
* ''WesternAnimation/TheHollow'': The devil dogs have glowing eyes that have a reddish tint.
* The Grinch in ''WesternAnimation/HowTheGrinchStoleChristmas'' has red pupils on yellow for most of the film. His eyes turn blue-on-white during his HeelFaceTurn, then switch back (by mistake?) for a few shots, then stay blue.
* In ''WesternAnimation/IvickVonSalzaTheLittleLumberjack'', whenever the yeti gets mad, his eyes turn red.
* In ''WesternAnimation/JackieChanAdventures'', the Shadowkhan and the Demon Sorcerer BigBadDuumvirate, among others, have red eyes. When Jade and later Valmont get possessed by the show's overall BigBad Shendu, their eyes turn red whenever HE'S in control of their body.
* ''WesternAnimation/JonnyQuest'' TOS episodes
** "Monster in the Monastery". The fake yeti (who are malicious enemy agents) have red eyes.
** "The Robot Spy". The titular opponent - which was sent by the DiabolicalMastermind Doctor Zin - has one large red eye.
* Played with in ''WesternAnimation/TheLegendOfKorra'': The [[StatuesqueStunner imposing]] and [[TheBrute scary]] [[BombThrowingAnarchists Red Lotus]] [[HavingABlast combustionbender]] [[ColdSniper P'Li]] has eyes of [[DownplayedTrope an unusual shade of russet]]—which is [[JustifiedTrope still in keeping with the usual theme]] of [[PlayingWithFire firebenders]] having [[ElementalEyeColors gold or brown eyes]]—and a ''bright scarlet'' one [[PowerTattoo tattooed]] on her [[ThirdEye forehead]].
** Played straight with Unalaq, whenever he enters the Avatar State, and in his Dark Avatar form.
* The Biskit twins in ''WesternAnimation/LittlestPetShop2012'' have reddish eyes, though they're not so much evil as they are sheltered and distant from those around them.
* Dick Knubbler's robotic eyes turn red when he gets pissed off in ''WesternAnimation/{{Metalocalypse}}''. Not so much "evil" as "{{Jerkass}}", but when one works for five ChaoticNeutral musicians that cause destruction wherever they go (by accident, sometimes, even!), it's hard to call oneself "good".
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Discord's eyes are yellow with red pupils, and he used to be a villain.
** Fuzzy Legs the spider has solid red eyes, as part of his character's parody and subversion of stock portrayals of monstrous spiders.
** "[[Recap/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed Luna Eclipsed]]": The spiders created by Luna's spell have solid red eyes, as part of their exaggerated monstrous appearance.
** "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]": The [[ArtifactOfDoom Alicorn Amulet]] makes the wearer's eyes go red. Trixie, who showcases the effect, becomes drunk with power and starts acting outright like a tyrant, as opposed to her moderate {{Jerkass}} tendencies.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E6PowerPonies Power Ponies]]": Fluttershy's eyes turn red when a firefly was flicked out of the crosshairs of the weapon as part of her HulkingOut.
** "[[Recap/MyLittlePonyFriendshipIsMagicS4E7Bats Bats!]]": Fluttershy gets red eyes when she's turned into a [[OurVampiresAreDifferent vampire]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS5E13DoPrincessesDreamOfMagicSheep Do Princesses Dream of Magic Sheep?]]": Among the Tantabus' dream monsters, Monster Angel Bunny, the flying and some of the living houses have red eyes with yellow pupils.
** "[[Recap/MyLittlePonyFriendshipIsMagicS6E25ToWhereAndBackAgainPart1 To Where and Back Again: Part 1]]": Discord's pupils literally turn to fire for a moment when he learns the Changelings have captured [[MoralityPet Fluttershy]].
** "[[Recap/MyLittlePonyFriendshipIsMagicS7E2AllBottledUp All Bottled Up]]": The ponies affected by the inadvertent release of Starlight's [[HatePlague bottled anger]] have glowing red eyes.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E12MarksForEffort Marks for Effort]]": [[spoiler:Cozy Glow]]'s red irises are the first cue that she is actually a manipulative villain, which isn't shown until several episodes later.
** "[[Recap/MyLittlePonyFriendshipIsMagicS8E22WhatLiesBeneath What Lies Beneath]]": The spiders' eyes glow bloody red, strengthening Yona's original terror of them.
* ''WesternAnimation/TheNewAdventuresOfSuperman'': "The Japanese Sandman". The titular monster (who commits evil acts in return for a black pearl) has red eyes.
* ''WesternAnimation/{{Ninjago}}: Masters of Spinjitzu''. All the skeletons, Lord Garmadon and the Hypnobrai tribe have glowing red eyes.
* ''WesternAnimation/ThePenguinsOfMadagascar'':
** In "Dr. Blowhole's Revenge", Skipper activates a King Julien robot decoy.
--->'''Skipper''': Glowing red eyes. That's almost never good.\\
(''the robot explodes'')
** In "The Hoboken Surprise", all the animals are replaced with robots with red eyes.
* The first season of ''WesternAnimation/PoundPuppies1980s'' featured a villain named Captain Slaughter in some episodes. All we could see of his shadow-obscured face was a pair of sinister red eyes.
* ''WesternAnimation/ThePowerpuffGirls1998'' (and its [[Anime/PowerpuffGirlsZ anime]] counterpart) gives us Brick of the [[ThePsychoRangers Rowdyruff Boys]]. True to this trope, Brick loves to [[ChaoticEvil cause destruction and hurt others]].
** In the 1998 series' episode "Tough Love", the people put under HIM's mind control in his attempt to kill the girls sport red blank eyes, alongside an angry expression.
* Though a number of ghosts from ''WesternAnimation/TheRealGhostbusters'' have these, probably the most notable example is "The Umpire" from "Night Game". While for the most part a neutral judge and even a ReasonableAuthorityFigure, his eyes glow ''bright red'' once and only once: when Peter so much as implies [[BerserkButton a human soul isn't the most valuable thing in existence]]. [[OOCIsSeriousBusiness Peter immediately takes it back]].
* ''WesternAnimation/SamuraiJack'' has Mad Jack, Aku's embodiment of Jack's own dark side.
* ''Franchise/ScoobyDoo'':
** ''WesternAnimation/ScoobyDooWhereAreYou'' episode "A Gaggle of Galloping Ghosts". The [[UsefulNotes/{{Romani}} Gypsy]] FortuneTeller, who turns out to be the episode's {{villain|s}} in disguise, has red eyes.
** Some of the ghosts from the Chest of Demons that Scooby and Shaggy are tasked with recapturing after being tricked into releasing them in ''WesternAnimation/The13GhostsOfScoobyDoo'' have red eyes.
*** Maldor the Malevolent in "Scoobra Kadoobra" starts out with yellow eyes, but at one point his eyes turn red when he glares at Daphne. A bit later, his eyes stay red for the rest of the episode.
*** The Reflector Specter from "Reflections in a Ghoulish Eye" is a hideous red-eyed demon who hides in mirrors.
*** Marcella, who is recaptured by the gang in the episode "When You Witch Upon a Star", has red, pupil-less eyes.
** The evil clones of Mystery, Inc. in the ''WesternAnimation/WhatsNewScoobyDoo'' episode "A Scooby-Doo Valentine" have red eyes.
* ''WesternAnimation/SheRaAndThePrincessesOfPower'':
** Hordak's eyes are a flat red glow, without iris or pupil. He's the BigBad.
** When corrupted by a First One virus, Adora gains these [[SuperMode in her She-Ra form]]. Corrupted Adora is TheBerserker, and is generally best avoided; in She-Ra form, Adora can break rocks, and while corrupted, she has ''absolutely'' no goals beyond mindless bloodshed.
** Averted with Entrapta. While she has dark red eyes and wears a creepy, red-eyed welding mask, she's TrueNeutral and most of the damage she causes is in pursuit of [[ForScience learning something new]], as opposed to evil; indeed, she ends up as a TokenGoodTeammate to the Horde after her defection.
* In ''WesternAnimation/{{Slugterra}}'', the eyes of mecha-beasts turn red when they are ghouled; as seen in "Mecha Mutiny".
* Dr. Julian Robotnik from ''WesternAnimation/SonicTheHedgehogSatAM'' has a pair of red cybernetic optics that shine like hellish spotlights in the dark.
* Squidward, Plankton, and Man Ray from ''WesternAnimation/SpongeBobSquarePants''. Averted with Gary. Ironically, the former two are now the most sympathetic characters on the entire show.
* ''WesternAnimation/StarTrekLowerDecks'':
** It's revealed that the Tamarian expression for "Oh, crap!" is "Zinda, his eyes red!"
** Admiral Buenamigo's pet project, the fully-automated ''Texas''-class U.S.S. ''Aledo'', starts glowing red when [[spoiler:its corrupted A.I. causes it to turn on and kill Buenamigo before attacking other Starfleet assets]].
* ''WesternAnimation/StarWarsTheCloneWars'':
** Cad Bane is a Duros bounty hunter with red eyes. He's an extremely dangerous fighter and crack shot with a blaster, and he most certainly WouldHurtAChild in exchange for a paycheck.
** Season 3's Mortis trilogy has the Son, AnthropomorphicPersonification of TheDarkSide, combined with black sclera.
* On ''WesternAnimation/StarWarsRebels'', [[KidHero Ezra Bridger's]] eyes take on a reddish tinge when he opens the Sith holocron, signifying the growing influence of TheDarkSide on him.
* ''WesternAnimation/{{Superfriends}}'':
** The 1973 episode "Menace of the White Dwarf". The evil MadScientist Raven (who acts more like a {{Comic Book|s}} supervillain than any other opponent the Superfriends faced during this season), has red eyes.
** The evil Superman from the 1979 episode "[[MirrorUniverse Universe of Evil]]" has red eyes as well, and for bonus points, they're ringed in black, [[http://images2.wikia.nocookie.net/__cb20090623171754/superfriends/images/6/6a/EvilSuperman.png with freakin' huge demonic points]]. Evil!Batman and Evil!Robin also have red eyes in place of their good counterparts' [[MonochromaticEyes plain white eyes]].
* ''WesternAnimation/TeenTitans2003'':
** Trigon, [[SatanicArchetype very bad dude]] indeed.
** Brother Blood, BigBad of the third season, has eyes that glow red when he uses his PsychicPowers; in the fifth season, the mechanical eyes on the skull-"face" on the Brain's life-support pod also glow red when the Brain is interfacing with his computers or is just angry.
** Red Star's eyes are normally green, [[MonochromaticEyes lacking pupils or whites]]. When his uncontrollable and incredibly destructive radioactive powers start to activate, they glow red.
** Raven isn't evil and her eyes are normally a deep purple, but when she goes OneWingedAngel her eyes glow solid red. And suddenly there's ''four'' of them. [[spoiler: Makes sense since Trigon's her dad.]]
* Nearly all the Decepticons of the original ''Franchise/{{Transformers}}'' (notably the [[WesternAnimation/TheTransformers original cartoon]]) had red optics. Later versions had a bit more optical variety.
** The episode "Attack of the Autobots" had the BrainwashedAndCrazy Autobots' optics turn red, being restored to their normal blue when cured.
** ''WesternAnimation/TransformersAnimated'' has all red-eyed (or in the case of Soundwave, red-''[[CoolShades sunglassed]]'') Decepticons like the original cartoon, with the exception of the nominally-a-Decepticon Swindle, who has purple eyes. However, Sari Sumdac, a ''human child'', also appears to have red eyes. [[spoiler:They turned [[https://static.tvtropes.org/pmwiki/pub/images/vlcsnap-488331.jpg blue]] after she [[SuperMode "upgraded" herself.]]]] Also, in ''Animated'', Wreck-Gar's eyes turn red when he threatens to destroy Detroit as a reference to ''WesternAnimation/TransformersTheMovie'' and his G1 counterpart's toy commercial. An interesting example occurs in Wasp. Originally, he had blue eyes, but after his stay in prison (and subsequent madness and desire to turn Bumblebee into iron filings), they become purple. And what color do you get when you mix red and blue?
*** [[spoiler:The Autobots']] eyes also turned red when they were brainwashed by [[spoiler:Soundwave]] into being evil.
** Pops up a few times in ''WesternAnimation/BeastWars''', despite bots like Rattrap and Rhinox just normally having red optics, to warn you things are about to get real. When Megatron becomes a transmetal the first you see of him are his glowing red eyes against a silhouette, Silverbolt's eyes are normally gold but when Blackarachnia was killed and he uttered Tarantula's name in a vengeful manner [[BewareTheNiceOnes they]] [[RoaringRampageOfRevenge turned]] [[NightmareFuel red]], and most notably when Rhinox is reprogrammed as a Predacon his normally wise red eyes glow blood red for ''[[VilerNewVillain very good reason]].''
** [[DemonicPossession False Convoy]] in ''[[Manga/TransformersZone Transformers: Return of Convoy]]'' is distinguished from Optimus Prime by having red eyes instead of blue.
** ''[[ComicBook/TransformersShatteredGlass Shattered Glass]]'', of course, reverses this, with the Decepticons mostly having blue optics and the Autobots mostly having red ones. Though there are a fair number of green, yellow, and other oddball optic colors on both sides, and Heatwave strangely has red optics despite being a nice guy, even by his fellow Decepticons' standards. [[spoiler:Turns out, it's because he's not actually from the SG universe at all.]]
* In ''WesternAnimation/WinxClub'' , although Bloom is a friendly, easygoing and sweet girl most of the time, if you commit the mistake of pissing her off enough (and trust us, it's very hard to achieve it) you'll see LITERAL FLAMES coming from her eyes...
* In ''WesternAnimation/WhatIf2021'', the eyes of [[spoiler:Doctor Strange]] slowly turn to red as he absorbs more and more power from [[spoiler:all the extra-dimensional creatures he consumes]], along with an increasingly demonic appearance and unhinged behaviour.
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