->''Clark says, "Hey, Ma. You remember the last person I told the secret to? I forget her name, but I recall she died of a slow, hanging, asphyxiation style death while I screamed to the Heavens. Alexia...Alena...I don't know, doesn't matter. I only married her. Point being, when I tell people my secret, they often DIE." Ma Kent says, "Hey, Tom, that's not in the script."''
-->-- '''Neal Bailey''' [[http://www.supermanhomepage.com/tv/tv.php?topic=reviews/smallville5-ep11 on]] ''{{Series/Smallville}}'' ("Lockdown")

This is when, normally in a movie or television adaptation of a superhero story, the villain discovers the hero's secret identity, but is killed in that same story/arc/episode/whatever two minutes after.

This is done to heighten the dramatic tension between the two enemies, as now both are on a level playing field and the villain's threat level is elevated. However, the writers (normally) don't let the villain last that long, since if there's a bad guy out there who knows the biggest secret of the mythos, he'd definitely eclipse all other bad guys and would never cease to be a threat, at least not until he's put down for good. This can also come in the form of a coma, amnesia, or imprisonment for years and years.

A sub-trope of ItsPersonal and KilledToUpholdTheMasquerade, but in this situation it's normally the writers' decision to pull the SecretIdentity trigger when they need to raise the stakes on a particular story/arc/series, but don't want to deal with long-term consequences.

'''As a DeathTrope, all Spoilers will be unmarked ahead. Beware.'''


[[folder:Anime and Manga]]
* This sometimes happens to ''Anime/SailorMoon'' villains. Specific examples are Jadeite and Nephrite in the first series, and all of the Animamates. In Jadeite, Sailor Iron Mouse, and Sailor Aluminum Siren's cases, they were both killed by the main Big Bad of the series before they could tell the Big Bad they followed about at least one Senshi's secret identity (Siren and Jadeite both died pleading that they had that knowledge, but Iron Mouse didn't even get a chance to say anything about it to Galaxia, she was so scared and blabbering about unanswerable Japanese riddles).
* ''Manga/DetectiveConan'': Pisco, a member of the Black Organization, figures out Ai's identity, but he's executed by Gin for screwing up on an assassination before he can say anything. (On the other hand, Vermouth also knows, but keeps mum due to her friendship with Shinichi's mother and perhaps also a desire to see whether or not Shinichi succeeds in taking the organization down.)
** Subverted with Irish in the 13th film (Raven Chaser). He is shot to death yet not ''specifically'' due to this trope, but shielding Conan himself from Gin's attempt to shoot him down. Then again, Irish was probably aware of the trope and decided to go down in his own terms, since he uses his FamousLastWords to challenge Shinichi/Conan to take down the Black Organization.
** Averted in ''Anime/LupinIIIVsDetectiveConan'' by Lupin III and his gang, who somehow figured out Conan's true identity but kept his secret.
* In an issue of Creator/GoNagai's ecchi superhero manga, ''Maboroshi Panty'', when Waki, the Villain of the Week, unmasks the title heroine ([[AssShove in a most unusual way]]), she immediately [[{{Hammerspace}} pulls out a hunting rifle]] and offs him.
* Subverted big time in ''Anime/CodeGeass''. After Villetta walks in on Shirley's discovery that Lelouch is Zero, she goads her into turning him in. Shirley, who has been in love with Lelouch, yet wanting to avenge her father's death that he was responsible for as Zero, freaks out and shoots Villetta... who gets better, courtesy of Ohgi.
* ''Anime/BubblegumCrisis'': Invoked when [[CorruptCorporateExecutive Brian J. Mason]] takes on the Knight Sabres in combat, and forces the visor of Sylia's helmet open, exposing her identity. It takes but a second for him to recognize her, and only a second longer for Sylia to [[BladeBelowTheShoulder silence]] [[ImpaledWithExtremePrejudice him.]]
* A more literal example than most in ''Manga/{{Basara}}''. Series heroine Sarasa has [[MySiblingWillLiveThroughMe disguised herself as her dead brother Tatara]] to lead a rebellion against the Red King, the man who had Tatara killed. Under her real identity, she met and fell in love with a guy named Shuri... who is secretly the Red King. Lord Shidou, one of the Red King's CoDragons, lures Tatara into a trap and is about to kill "him"... until he recognizes her as Shuri's girlfriend and freezes just long enough for one of her supporters to shoot him with an arrow.
* Inverted in ''Manga/{{Superior}}''. The king figures out that Sheila is the demon queen after he's been fatally injured and is too weak to tell anyone.

[[folder:Comic Books]]
* ''ComicBook/IdentityCrisis''. We learn that during UsefulNotes/TheSilverAgeOfComicBooks and UsefulNotes/TheGoldenAgeOfComicBooks, villains learned superheroes' secret identities all the time. Heroes toed the line of the MoralEventHorizon by using Zatanna to make them forget.
* In the ''Franchise/{{Batman}}'' comics, the Ra's al-Ghul subversion is the same as in ''WesternAnimation/BatmanTheAnimatedSeries''.
** The Riddler learnt during the ''ComicBook/BatmanHush'' storyline after using one of Ra's al-Ghul's lazarus pits, and was convinced not to blab it since a riddle ("Who is Batman?") is worthless if everyone knows it, not to mention that doing so would alert Ra's al-Ghul that he used a pit without permission. Later, he got both EasyAmnesia and a HeelFaceTurn as well.
*** The Hush storyline in general makes it seem Batman sucks at keeping secrets, as it brings together just about everyone who knows his identity, then throws in a couple more.
** In various continuities, Batman tells Joe Chill that he's the son of Thomas and Martha Wayne. In ''Batman'' #47 (1948), Chill blurts out to some other criminals that he "created" Batman, and they kill him. In Modern Age ''Batman: Year Two'', Chill gets killed by the Reaper. ''WesternAnimation/BatmanTheBraveAndTheBold'' is similar to the Golden Age version, however Batman saves Chill... but sees him get killed by falling masonry.
** Averted by ComicBook/RasAlGhul. He knows Batman is Bruce Wayne, but has no desire to tell anyone. Not because he wants to protect Bats, he just thinks it's irrelevant. Bane knows as well, but like Ra's, doesn't really care.
** Perhaps a reason why ComicBook/TheJoker has JokerImmunity is that he has had opportunities to learn Batman's secret identity, but for the most part, he does not ''care'' to know. For him, matching wits against Batman is what interests him most and having that air of mystery removed from his nemesis would make him less entertaining a foe.
*** Joker tries to invoke this trope in the Creator/JohnByrne {{Elseworlds}} ''Generations'', where all of DC's characters age in real-time. By 1975, he's an old man on his deathbed, and asks Batman (now Bruce Wayne, Jr.) to unmask as a final request. Batman cheerfully tells him to go fuck himself.
** In the "Mike and Allie" issue, three thieves try to break into [[BigFancyHouse Wayne Manor]] by digging in from the sewers, accidentally come across the [[ElaborateUndergroundBase Batcave]] and put two plus two together to figure out Batman's true identity. The thieves make their way back to the sewers, thinking that they can make a fortune selling the information. Two of the crooks are killed by the leader of the trio for tying [[OldRetainer Alfred]] up instead of killing him (plus she gets a bigger share of the profits that way) while she meets her end when she pisses off a girl who has a PsychicLink with a very large SewerGator.
* ''ComicBook/SpiderMan'':
** The comic book incarnation of the Harry Osborne Green Goblin and, after coming BackFromTheDead, Norman Osborne, both knew Peter Parker is Spider-Man, and have frequently acted on this knowledge. So did Venom. This is part of the reason the Goblin and Venom used to be his most dangerous enemies.
** The original Green Goblin actually had known Spider-Man's secret for a long time, but he did suffer from a convenient partial amnesia (when he wasn't Goblin-crazy, he couldn't remember what he had done as the Goblin and therefore also not that Peter Parker was Spider-Man) that later also affected his son Harry.
** ''The Amazing Spider-Man'' #200 featured Spider-Man's confrontation with [[NoNameGiven the burglar]] who killed Uncle Ben. After Peter unmasked in a scene that reads like a ShoutOut to the Franchise/{{Batman}}-Joe Chill showdown, the burglar suffers a fatal heart attack. In the first movie, the robber dies in a self-inflicted accident after Spider-Man pulls his mask off to him when he catches up with him in an abandoned house.
* ''World's Finest'' #173, "The Jekyll-Hyde Heroes!" Dr. Arron develops a PsychoSerum that turns the drinker into their most feared enemy and doses both Batman and Superman. He's hit with his own serum at the end, and since he fears both heroes equally, he turns into a half and half version of them. He's also learned their secret identities, but overexposure to the serum leaves him a raving lunatic.
* This happens ''every time'' someone sees the face of ComicStrip/ThePhantom - quite in line with the Old Jungle Saying that says that anyone who does so will die a horrible death. This is despite the fact that The Ghost Who Walks really doesn't have a secret identity - and neither is he the supernatural being the Old Jungle Sayings assume he is.
** To be fair, the (current) Phantom's wife, adoptive son, and presumably his real children have all seen his face without a mask too, and none of them have so far died horribly for it. Presumably the Old Jungle Saying has a caveat built in for voluntary de-maskings.
* Averted in an ''ComicBook/AstroCity'' story in which a small-time hood accidentally discovers Jack-in-the-Box's identity. He considers selling the information to the hero's enemies... until it occurs to him that those enemies are ruthless enough to use [[TortureAlwaysWorks cheaper methods]] to make him talk, after which [[YouHaveOutlivedYourUsefulness they would no longer need him alive]] and indeed [[HeKnowsTooMuch would prefer him dead]]. He leaves town, apparently intending to forget the whole thing.
* Happens to Amanda Marie [=McCoy=] in the Franchise/{{Superman}} comics. She is hired by Lex Luthor to find out Superman's identity. She does, he doesn't believe her. She steals his Kryptonite ring and sets out to prove herself right. She confronts Clark Kent in a grave yard, proving her theory correct. In the end, however, she is killed by a couple of common street thugs completely unrelated to her discovery.
* In a [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]] ComicBook/GreenArrow story, a petty criminal stumbles upon the heroes' secret lair and discovers their secret identities. He uses the knowledge to blackmail them into letting him hide out there, and gives his criminal buddies their patrol schedule so they can commit crimes without worrying about running into the archers. When he discovers they plan to kill Green Arrow and Speedy, not just avoid them, he performs a HeroicSacrifice to save their lives.
* The first time a (non-Loki) villain learned [[ComicBook/{{Thor}} Thor's]] secret identity[[note]]''Journey Into Mystery'' #95[[/note]] zig-zags this trope. The villain, a MadScientist with a duplication ray, unceremoniously falls to his death by the story's end - but moments before, he'd created a double of himself, who gleefully defies NoOntologicalInertia and survives even after the ray's been smashed. Thor, knowing the ray [[MirrorMoralityMachine reverses the morality]] of any human it duplicates, lets the double live on so his scientific genius can be put to good; no mention is made of whether the double ''also'' knows his secret identity.

* ''Film/SpiderManTrilogy'':
** ''Film/SpiderMan1'':
*** Green Goblin is impaled soon after he discovers Peter's secret.
*** The robber who (apparently) killed Uncle Ben dies in a convenient accident seconds after Spider-Man unmasks to him.
** ''Film/SpiderMan2'':
*** A big part of the movie marketing was that Harry would learn Peter's secret, but Harry's death wouldn't come until he made the full transition to baddie in the third movie... and even then it got [[HeroicSacrifice somewhat subverted]] in the end.
*** Peter also reveals his identity to Doc Ock, probably knowing that this trope would spell death for the doctor. This may not apply entirely to him, as by this point Ock was no longer until full control of his arms, and Spider-Man revealing his identity is a way to convince Ock to do a HeelFaceTurn. He might no longer be considered a villain by the time he performs his HeroicSacrifice, leading this to a case of RedemptionEqualsDeath.
*** Averted by the people in the runaway train, thanks to Peter willingly turning himself over to Doc Ock soon after. Probably helped that they gave him his mask back and decided to keep his secret.
** ''Film/SpiderMan3'': In the final movie, this works against Eddie Brock/Venom, but actually leads to the redemption of the Sandman.
* Subverted in the ''Film/TheAmazingSpiderman'': of the four people who learn that Peter is Spider-Man, the only one who dies after discovering this is Police Chief George Stacy. Dr. Connors, Gwen, and the construction worker's son are all spared, despite being in dangerous situations either at the time of or soon after their respective revelations, with one of them being the film's BigBad to boot.
* Subverted in ''Film/SpiderManHomecoming'', where the Vulture learns of Spider-Man's identity, but ultimately chooses not to reveal it as Spidey had saved him and his daughter on separate occasions.
* In the ''Film/{{Batman}}'' film series, Bruce Wayne inadvertently reveals his identity to Max Schreck during the climax of ''Film/BatmanReturns'', and Max is deep-fried soon after. In ''Film/BatmanForever'', Two-Face and the Riddler get taken out soon after they learn the truth: Two-Face suffers a DisneyVillainDeath and The Riddler [[GoMadFromTheRevelation goes mad from]] [[HoistByHisOwnPetard his Box technology getting destroyed by Batman]], and is later seen in Arkham proclaiming that ''he'' is Batman and laughing.
** Vicki Vale and Catwoman, however, manage to survive after learning Bruce Wayne's secret in ''Batman'' and ''Batman Returns''.
* ''Film/MysteryMen'' plays with this trope as the main baddie knew for years his archenemy's secret identity, but was in prison. When he gets out, it doesn't take too long before the BigBad uses his knowledge to kill the hero. Wait... what?
* In ''Film/BatmanBegins'', Ducard/Ra's al-Ghul knows that Bruce Wayne is Batman, but is spared by this knowledge due to Bruce thinking of Ducard as an ally. When Ducard reappears in the finale as the BigBad, he's toast. Rachel Dawes, for her part, is spared...
** ...until halfway through ''Film/TheDarkKnight'', thanks to that lying Joker.
*** On principle, breaking her promise to wait for Bruce and agreeing to marry Harvey Dent mere moments before her untimely demise probably didn't help her odds, either.
*** Technically, it's a subversion, since knowing Batman's identity had nothing to do with her death beyond her close association with him.
** Invoked with Mr. Reese who is targeted by the Joker to prevent him airing Batman's identity, because that would ruin the Joker's fun.
* In the 1949 serial adventures of Film/{{Batman and Robin|Serial}}, [[http://batman.wikia.com/wiki/Jimmy_Vale Jimmy Vale]] (who is working for the BigBad) discovers that an unconscious Batman is his [[http://en.wikipedia.org/wiki/Vicki_Vale sister's]] boyfriend. He puts on the suit and leads the other bad guys away from Bruce. Unfortunately, "away" means up to the top of a building where he then falls off.
* In the 2004 action film ''WesternAnimation/TheIncredibles'', Syndrome learns not only their real identities, but knows where they all live by the end of the movie. He ends up in [[TurbineBlender a jet turbine]] thanks to [[CapeSnag his flashy cape]] he uses for [[HoistByHisOwnPetard theatrical effect]].

* Played with in the first 'episode' of ''Literature/{{Relativity}}'':
-->'''Overcast:''' As much as I hate to say it, Yule does have a point. You get carried away sometimes and say things that might get you in trouble. I mean, [[NoodleIncident there was that time down at the pier.]]
-->'''Black Torrent:''' Yeah, I know.
-->'''Overcast:''' And that time with Master Blankard. [[LaserGuidedAmnesia Itís a good thing he hit his head and forgot everything.]] Oh, and then there was that time with Vera Barracuda--
-->'''Black Torrent:''' Whose side are you on anyway?
** This trope is also mentioned when Greg learns Dark Flame's identity:
--->'''Yule:''' Donít you read the comic books? You figured out the identity of the superheroes. That means you need to die.
--->'''Greg:''' Really?

[[folder:Live Action TV]]
* One episode of ''Series/{{Batman}}'' had King Tut break into the Batcave and deduce Batman and Robin's secret identities. As luck would have it, just before he could reveal it, a rock hit him on the head and reverted him back to his mild-mannered professor half of his SplitPersonality. It also caused him to forget the whole escapade as well.
* UpToEleven in ''Series/{{Smallville}}''. Practically all villains who learn Clark's secret are killed off, thrown into the psycho prison or have their memory wiped. Lex Luthor himself had went through all three.
* In ''Series/AgentCarter'', a captured hostage details how he was beat up by a female agent with a British accent. Agent Kreminski seems on the verge of realizing that he's talking about Peggy, but at that point he is gunned down by an assassin.
* ''Series/LoisAndClark'':
** When Clone Lois tells Lex Luthor she's learnt that Clark is Superman, the Karmic Death is just a matter of time.
** Earlier, Jason Trask threatens Clark with revealing his secret identity if he goes to prison. Conveniently, he's soon shot by a policewoman defending Clark, who wasn't present at the scene when Clark used his powers.
** Later, Lex Luthor, Jr. and his hired lackey find a recording of Lex Luthor revealing Superman's identity. Both are dead by the end of the three-part arc.
** Somewhat surprisingly averted with Jason Masick, who finds a diary written by a time traveling villain who knew Superman's identity. While he uses the knowledge to blackmail Clark for a time, Clark eventually finds and destroys the diary and believes that the lack of proof will be sufficient to keep Jason's knowledge from being a problem. Jason himself simply goes to prison and nothing more ever comes from it. The same episode plays it straight with Luthor's former right-hand man, Nigel, who worked with Jason: Jason [[YouHaveOutlivedYourUsefulness poisons him]] rather than share the spoils of his criminal acts.
** Perhaps the fastest discovery-to-death example is District Attorney Mayson Drake: badly injured in a car bomb, her death was all but assured when she noticed that the blast had ripped open Clark's shirt, revealing the Superman suit beneath.
* Two criminals in ''Series/TheAdventuresOfSuperman'' stumble onto Superman's secret identity. Unfortunately for them, in this series he doesn't have other superheroes in disguise, holograms, or such to throw them off the trail. He takes them off to a remote cabin high in a mountain range and tells them he'll keep bringing them supplies. They don't believe him and try to escape, dying in the process.
* An episode of 1990 ''Series/{{The Flash|1990}}'' live-action series has a baddie discovering his SecretIdentity and blackmailing him (even with a TheyWouldCutYouUp threat). He ended up killed by [[BigDamnVillains other baddies]], with a [[ExternalCombustion Car Starter Bomb]].
* Strangely averted by ''Series/BuffyTheVampireSlayer'': Everyone seems to believe that it's incredibly important for no one to realize that Buffy is, in fact, a slayer, even her mother. Most of the villains already know, however, and when the muggles eventually find out, by and large there are no ramifications whatsoever.
** It's more the fact that any time a vampire comes across a lone, blonde teenage girl who, instead of screaming in terror, makes threats and pulls out a stake, they can be reasonably sure that it's the Slayer; most of the time, they dismiss her until she gets to ready to fight, and then their eyes bug out and they say "It's the Slayer!" Her house hasn't really even been attacked by vampires (though that could also be because they can't come into dwellings without an invitation). Still completely averted with Glory though, a non-vampire BigBad who knows Buffy's name and address and even visits her house to have a "nice" chat; Glory doesn't die until many episodes after that.
* It happened to any bad guy who learned Zorro's secret identity in Disney's live action ''Franchise/{{Zorro}}'' series.
* In ''Series/{{Ringer}}'', Gemma learns that it's Bridget pretending to be Siobhan, and gets murdered, or at least disappeared, soon after.
* ''Series/{{Arrow}}'':
** In the pilot, Oliver (who hasn't even donned his costume yet) gets kidnapped by a bunch of masked goons. He proceeds to slip his bonds and kill them all, specifically [[NeckSnap breaking the last one's neck]] so he can't tell anyone how a rich playboy has the fighting skills to do all that.
** When the Count returns in Season 2, he catches Felicity investigating his operation, and from her working relationship with Oliver and Oliver posing as a Vertigo buyer the previous season, the Count quickly deduces that Oliver is the Arrow. One hostage situation later, and he's been KilledOffForReal via three arrows to the chest and a [[DisneyVillainDeath multi-story drop]] out of [[DestinationDefenestration a window]].
** Also in "Seeing Red" Moira reveals that she has long known Oliver's secret identity and is impaled by Slade's sword later in the episode.
** To show his renewed ruthlessness in Season 5, Ollie escapes his bonds while a crooked cop is tormenting him. He easily overpowers the cop and the cop pleads for mercy when he realizes Ollie is trying to break his neck. Ollie apologizes but says he can't let the cop live as he now knows his secret.
* The 2014 ''[[Series/TheFlash2014 Flash]]'' series sees several people learn Barry's identity:
** After Barry defeats Girder, his SchoolyardBullyAllGrownUp, he reveals his identity in order to gloat in front of his former tormentor. In the very next episode, Wells sics Girder on that week's villain and the bully is killed in the fight. The other villain also recognizes Barry as the Flash and dies at the end of the episode.
** Subverted with Captain Cold. He learns the Flash's identity, but Flash plays on Cold's desire for a WorthyOpponent and they strike a deal not to escalate their fights. While Cold does eventually die, it takes a long time (billions of years, technically) and a [[Series/LegendsOfTomorrow whole other show]].
** General Eiling reveals to Wells that he's identified Barry after seeing him unmask in an earlier confrontation. At the end of the episode, Wells abducts Eiling and reveals his own identity as the Reverse-Flash - just before he delivers Eiling to Grodd, a KillerGorilla with a grudge. [[spoiler:Subverted when Eiling turns up alive later - Grodd made him BrainwashedAndCrazy, but didn't kill him. He's freed from Grodd's control at the end of the episode and lets Barry know that he still knows the Flash's identity and still intends to antagonize him.]]
** In Season 4, Iron Heights warden Wolfe learns Barry's secret identity. He ends up being killed by [=DeVoe=] in the next episode.
* In the ''Series/{{Highlander}}'' episode "Methuselah's Gift", Watchers Daniel Geiger and Nathan Stern find out that Adam Pierson is an Immortal. Geiger kills Stern as part of his plan to become immortal and is subsequently killed by Amanda to thwart said plan.
* The GrandFinale of ''Series/SpiderManJapan'' had Amazoness confirm her long-held theory that Takuya Yamashiro was Spider-Man's secret identity. [[YouHaveFailedMe Professor Monster ends up killing her for failing to kill Spider-Man]].

[[folder:Video Games]]
* The main story in ''VideoGame/HitmanContracts''. The BigBad Albert Fournier discovers 47 at the start and tries to kill him. [[SarcasmMode Surprisingly]] it later comes back to bite him as 47 kills him by the end of the game in order to protect his identity.
* ''VideoGame/BatmanArkhamCity'': Hugo Strange deduces Batman's secret identity, but [[WhatAnIdiot lords it over him instead of revealing or copying his knowledge]], and is killed by Ra's al Ghul before the game ends. Ra's and Talia also know and are also killed later, along with the local Lazarus Pit for good measure.
* ''VideoGame/BatmanArkhamKnight'':
** Played with. The Scarecrow lost his mind to his fear toxin shortly after unmasking Batman as Bruce Wayne, reduced to a gibbering wreck unlikely to function anytime soon. But he had the foresight to broadcast the unmasking live on television, and unlike most examples, he successfully pulled it off without a hitch. With everyone (including the surviving members of his RoguesGallery) now knowing Batman's secret identity, Bruce and Alfred are forced to go underground after their work is done, [[FakingTheDead destroying Wayne Manor with them seemingly inside]].
** Averted with Hush, who forces Batman to unmask during his side-quest. Bruce and Lucius Fox simply knock him out and stow him somewhere until the current cris is resolved. As the above example indicates, the finale makes his knowledge a moot point.
** Ra's al Ghul returns, as is his habit, during a DLC mission. Whether he survives ''that'' is down to you.
* At the end of Season One of ''Videogame/BatmanTheTelltaleSeries'', Batman is given the option to unmask himself before Lady Arkham in order to save Alfred. Regardless of his decision, she ends up getting crushed by falling debris.

[[folder:Western Animation]]
* In ''WesternAnimation/BatmanTheAnimatedSeries'', this is subverted as Ra's al-Ghul actually knew Bruce Wayne's secret for a long time, but never planned to expose it to the world or even hold it over Bruce's head, and his death came [[WesternAnimation/BatmanBeyond years and years]] after the first conflict with Batman.
** Hugo Strange also learns it, and lives. However, Batman sets him up and makes the supervillains he's trying to sell the info to think he's planning to betray them. [[CassandraTruth Consequently, none of them believe him when he tells them the truth]]. Even Strange himself is left [[ThisCannotBe baffled]] when he sees Batman and Bruce Wayne (the latter actually [[IdentityImpersonator Dick Grayson in disguise]]) simultaneously.[[note]]However, ''WesternAnimation/JusticeLeagueUnlimited'' implies Strange later changed his mind, and helped Amanda Waller deduce Batman's secret identity.[[/note]]
** DirtyCop Gil Mason removes Batgirl's mask and realizes it is Barbara Gordon, whose father he'd been framing and being said girl he likes. He is so horrified by the discovery he lets her go and hits his head. Mason falls into a coma and is never seen or mentioned as having come out of it.
** ''WesternAnimation/BatmanBeyond'': Before he can expose Bruce and Terry's secret on a tabloid television program, [[IntangibleMan Ian Peek]] suffers from complete PowerIncontinence, becomes completely intangible and falls to the Earth's core never to be seen again.
*** Barely averted in another episode "Unmasked". Terry had to unmask himself to comfort a scared little boy named Miguel that he was trying to rescue from a burning building. When Kobra agents see a news report with Miguel saying that Batman's a normal guy without his mask, they kidnap the boy to pry the image of Batman's face out of his mind and plan to drop him into a snake pit afterwards. Terry rescues him and is relieved when he sees that the image of him that Kobra pulled from Miguel's mind has the face of Miguel's favorite action figure superimposed on it. Terry figures that Miguel didn't get a good look at him in the first place and doesn't remember what he looks like [[spoiler:but the end of the episode reveals that Miguel remembers him and is keeping his secret safe.]]
** ''WesternAnimation/BatmanBeyondReturnOfTheJoker''. Joker dies not long after telling Bruce he learned his secret identity after torturing Tim Drake. Twice, technically. This is subverted by Harley Quinn, who learned their identities the same way and seemingly fell to her death shortly afterward. The very last scene of the movie reveals she survived and is [[SingleMindedTwins Dee and Dee's]] grandmother, apparently having quit her life of crime after Joker died.
** ''WesternAnimation/BatmanTheBraveAndTheBold'' double-subverts this. Joe Chill learns who the face behind Batman is and decides to immediately take it to his rogues gallery so they can take him out in his personal life, but he uses the wrong wording and only gets out that "[He's] the reason Batman exists!" Before he can drop his identity, the villains immediately latch onto this and get ready to kill Chill. Batman eventually breaks free and takes them all down, and seems prepared to SaveTheVillain despite it being the end of his life as Bruce Wayne...then the building collapses in such a way that Batman can't save him even if he wanted to, and is forced to let Chill die in the destruction.
--->'''ComicBook/ThePhantomStranger:''' Funny how Chill just happened to be standing under that crumbling ceiling when it came down.\\
'''ComicBook/TheSpectre:''' [[BlatantLies I wouldn't know]] ''[[BlatantLies anything]]'' [[BlatantLies about that]].
* ''WesternAnimation/SupermanTheAnimatedSeries'': A corrupt police officer tries to kill Clark Kent when he finds incriminating evidence about the officer in a murder case. Clark survives (for [[NighInvulnerable obvious reasons]]), but lies low while he continues investigating. In the end, the officer is convicted and Clark mysteriously reappears. As he is sent to the gas chamber, he can't figure out how Clark could have survived, and then makes the inevitable conclusion ó "He's Superman!" ó just as the switch is pulled.
** In the 60's Superman cartoon, Parasite immediately learns Superman's identity when he drains Clark, which for the genre savvy is a clue that he is going to die at the end of that episode. And he does, by [[SuperpowerMeltdown absorbing so much energy from Superman that he explodes]].
** Parasite has learned it a couple of times in the TAS as well. He didn't die, but the necessary LaserGuidedAmnesia was usually delivered in a very unpleasant manner.
* In ''WesternAnimation/TheBatman'', shortly after Wrath and Scorn threaten to reveal Bruce's and Dick's secret identities, ComicBook/TheJoker doses them with his Joker Venom because ''he'' wants to be [[TheOnlyOneAllowedToDefeatYou the one who destroys Batman]].
* In ''WesternAnimation/IronManArmoredAdventures'', three villains have learned Iron Man's secret identity. One of them got slapped by LaserGuidedAmnesia and the other was put in a coma for the trouble. The third, ever the pragmatist, decided to keep it a secret so he could blackmail Tony with it after Tony had some major financial assets to his name. Since the secret identity was revealed to the public in the end of Season 2, him cashing it in seems unlikely.
* In the ''WesternAnimation/SpiderManTheAnimatedSeries'' episode "Attack of the Octobot" Spider-Man reveals his identity to a sick girl who is a fan of his and wanted to meet him. At the end we find out the reason he was willing to reveal his secret identity to her was because [[LittlestCancerPatient she was terminally ill]].
* ''[[WesternAnimation/TheSpongeBobSquarePantsMovie The SpongeBob SquarePants Movie]]'' gives us a subversion. Plankton finds out the Krabby Patty secret formula, but while he doesn't die he is arrested and WordOfGod confirms this is canonically the end of the series.
* One villain in ''WesternAnimation/StaticShock'' finds out Virgil's secret identity by using X-ray vision to see through his mask. At the end of the episode, he turns to [[TakenForGranite stone]]. Later on, he gets turned back, but since Virgil's powers were used to help restore him, it's inferred he kept quiet out of gratitude.
** Three other villains managed to learn the secret throughout the series, but none of them were so fortunate. [[HiveQueen Madeline Spaulding]] got a lightning bolt to the face that shorted out her telepathy and wiped her memory; [[TimeMaster Speedwarp]] was trapped in a TimeAbyss; and [[{{Technopath}} Omnara]] got short-circuited by a virus.