History Main / KillOnSight

* ''Manga/ElfenLied'' opens with Lucy having EscapedFromTheLab, killing twenty three guards in the process. Since she is so dangerous, the search party is instructed to kill her on sight.

* In ''VideoGame/XCOM2'' this is how ADVENT reacts to any resistance members when not conducting house arrests to arrest collaborators... who implicitly just get put through a KangarooCourt and, after [[ColdBloodedTorture brutal interrogation]], end up executed or [[FateWorseThanDeath worse]]. You can even find wanted holograms of your top soldiers from your curent, or previous game.

* In ''WesternAnimation/HowToTrainYourDragon'', the Book of Dragons describe every dragon depicted as dangerous and should be killed on sight. The only exception is the Night Fury which the books says you must hide from.

This trope covers any situation in which open season is declared on a individual or group of individuals, be it heroic or villainous.

* The ''Wiki/SCPFoundation'' policy on [[RealityWarper Reality Benders]] is straightforward: "kill that motherfucker before he knows you're even there." Their process for training people to face Reality Benders consists of getting them so high on drugs they'll believe anything they're told, then telling them things like the doors and windows have vanished and desks are going to kill them. It's the closest they can come to a Reality Bender attack without an actual Reality Bender, and they encourage their hunters to remember this moment if they ever think a Reality Bender can be contained or otherwise reasoned with.

* In ''ComicBook/TheInfinityGauntlet'', [[ComicBook/{{Warlock}} Adam Warlock]] insists that ComicBook/{{Thanos}} is too dangerous to be kept alive, so he instructs ComicBook/{{Wolverine}} and [[ComicBook/TheIncredibleHulk Hulk]] to kill Thanos rather than capture him.

Compare LeaveNoSurvivors, MurderIsTheBestSolution, and ShootEverythingThatMoves, which is this trope on a broader, less-discriminating scale.

Compare LeaveNoSurvivors and ShootEverythingThatMoves, which is this trope on a broader, less-discriminating scale.

** In ''VideoGame/Fallout4''you will eventually become KillOnSight to two out of three factions - [[MadScientist The Institute]], [[UndergroundRailroad The Railroad]] or the Brotherhood of Steel. This is because you will eventually reach critical points where you will become permanently hostile. With the Institute, you start out hostile until you meet Father, after which they become friendly. However, if you do anything to get banished - by either killing a named member, go to the Mass Fusion building with the Brotherhood or be discovered while smuggling weapons to synth rebels - they become hostile once again. With the Brotherhood, you are friendly in the beginning, but they turn hostile if you kill a named member or go to Mass Fusion with the Institute. The Railroad is trickier. If you bring your Institute aligned companion anywhere even near their hideout, they attack you on sight. If you progress a little too far in the Brotherhood’s quest line, they order you to attack the Railroad, at which point, the Railroad turns hostile, anticipating an attack. If you attack the Institute’s headquarters with the Minutemen, set their reactor to blow them up, but don’t issue an evacuation order, allowing synths to escape, the Railroad attack you on sight. The Minutemen are always kept friendly to you, just in case you antagonize all three other factions.

* In ''ComicBook/TheInfinityGauntlet'', ComicBook/AdamWarlock insists that ComicBook/{{Thanos}} is too dangerous to be kept alive, so he instructs ComicBook/{{Wolverine}} and [[ComicBook/TheIncredibleHulk Hulk]] to kill Thanos rather than capture him.

* ''Series/Batwoman2019''. After she escapes from their custody, Crow Security issues a B-42 Shoot To Kill order on Alice. Unknown to them the collapse of TheMultiverse has created an alternate universe version of Kate Kane's sister who is entirely innocent of her crimes, whom Batwoman now has to protect from them.