History WalkingSpoiler / LiveActionTV

** At first, it seems like Will Reeves was created for the series. Then in "This Extraordinary Being", he was revealed to be [[CanonCharacterAllAlong Hooded Justice]], a character who was ShroudedInMyth in the original comic -- meaning that Hollis Mason's InUniverse speculation in the original comic was [[AdaptationalBackstoryChange oh]], [[AdaptationNameChange so]] [[SparedByTheAdaptation very]] [[AdaptationalSexuality much]] [[RaceLift wrong]] [[AdaptationalNationality in]] [[AdaptationalJobChange this]] [[AdaptationalHeroism series]].

* ''Series/TheOrville'' has the Kaylon race, who are spoilers not in their existence, but in their ''actions''. Specifically, they are a race of [[AbsoluteXenophobe Absolute Xenophobes]] bent on the extermination of all organic life. Previously, it was assumed that they were like the ship's lone Kaylon, Issac, who acts more like a relatively benign RobotBuddy.

* Season 3 of ''Series/StarTrekPicard'' introduces Jack Crusher. His name alone makes it clear that his mother is Dr. Beverly Crusher; the next major reveal is that his father is Beverely's on-and-off lover, Adm. (ret) Jean-Luc Picard.

* ''Series/UglyBetty'': Alexis Meade, just by virtue of existing, gives away the major midseason twist that Alexander Meade is not only alive, but now female.

* Series/{{You}}: Almost all of Love Quinn’s tropes are spoiler-tagged, as the Season 2 finale tosses aside her NiceGirl image to reveal that she’s actually a deranged serial killer.

* ''Series/{{Degrassi}}'':

* ''Series/StarTrekDeepSpaceNine'': You can't talk about Ezri Dax (and her status as a permanent cast member) without spoiling. Because Dax's host is ''Jadzia'', and the symbiont only joins with a new host when the previous one dies... ''oh.''

* Series/{{You}}: The Season 2 finale reveal that the seemingly NiceGirl Love is actually a deranged serial killer means that almost all of her tropes are spoiler-tagged.

* Michael from ''Series/TheGoodPlace'' is characterized throughout Season 1 as an endearing, good-natured and somewhat clueless father figure to the residents of the titular MundaneAfterlife. The season finale reveals that he's [[BitchInSheepsClothing an agent of the]] "[[OurDemonsAreDifferent Bad Place]]" tasked with torturing the show's core cast, and Season 2 deals with his real (sadistic and manipulative) self experiencing a gradual HeelFaceTurn.

* ''Series/AmericanHorrorStoryAsylum'': The revelation that the infamous serial killer Bloody Face is the previously thought upstanding psychiatrist Dr. Thredson meant that every trope applying to the character is spoiler-tagged.

** Connor, whose very existence spoils the fact that: a) Angel gets a biological son; and b) Said son is given a PlotRelevantAgeUp via a YearInsideHourOutside situation. Even if you spoiler-tag the fact that he's Angel's son, you'd have to also tag his ''name'' in order to hide what happens to that adorable baby mid-way through Season 3.

** Malcom Merlyn, AKA The Well Dressed Man, AKA the Dark Archer. We already knew he was the leader of the show's NebulousEvilOrganisation, but what we ''didn't'' know until the MidSeasonTwist was that he's Tommy's father, and he - not Tommy - is the adaptation of the comic villain Merlyn the Archer.

** Season 5 has Adrian Chase, Star City's district attorney, who later during the season turns out to be Prometheus, the BigBad of the season, and the illegitimate son of a CorruptCorporateExecutive that Oliver killed all the way back in Season 1. His goal is to break Oliver and show him that he poisons everyone he comes in contact with.
* ''Series/BabylonFive'' had the great Minbari hero Valen, who is really the supposed to be dead Jeffrey Sinclair in disguise.

** Ben from season 5 is the physical vessel of the season's Big Bad. No one knows because there's a magic spell on him that makes any human forget.

* ''Series/DeadOfSummer'': Amy, after spending most of the show putting on the image of being TheCutie and a FinalGirl in the making, [[TheFakeCutie is revealed to be]] the BigBad in the penultimate episode.

** A character who's such a spoiler that they're tagged as "Spoiler Character" is ''Indogene'' Kenya, who is thought to be Kenya Rosewater BackFromTheDead, but turns out to be an Indogene clone that Niles Pottinger had made in an attempt to make Amanda his.

** Cam. His character lasted less than a season before committing suicide, and his entire arc was about building his depression and anxiety until his death.

** Iwan Rheon was told to tell nothing of his character in the third season, who is merely called "Boy" in the script, and he is the only new actor playing a big part that was not part of the promotional material before the season began. ''Everything'' about the character's identity, allegiance, aims and procedence is meant to be a mystery and the clues given by the show are intentionally contradictory. Of course, this being the case is a spoiler already because it means that viewers can't take for true any personality he goes by until then. Those who have read the source material know who he is, but the character's introduction was massively changed and his true identity is only revealed on screen in the season 3 finale: Ramsay Bolton.
** And now in season 4, the Night's King made his appearance. Though HBO would try to {{Retcon}} his existence on their site, referring to him as "another White Walker".

* ''Series/HowIMetYourMother'': The Mother herself. The premise of the series hinges around the story of how Ted met her, taking YEARS of building up story and story twists to lead to the MeetCute. The character was finally cast and shown in the eighth season finale, "Something New," which only has her boarding a train to go to the same wedding as everyone else. This sets the viewer that she will play a part in the next season but not actually ''meet'' Ted until the GrandFinale. As it turns out she's the catalyst for Barney and Robin's wedding, as a {{Flashback}} revealed that Barney met her coincidentally during the previous season.

** ''Series/KamenRiderGaim'' is absolutely awash in these:

** Creator/CharlieVickers had no idea [[spoiler:he was going to play Sauron]]. He learned only during the filming of the third episode that [[spoiler: Halbrand and Sauron are same characters]].
** The Stranger from the meteor has no name and no identity. Initially, is hinted he may be Sauron, but at the end of Season 1 we learn that he is [[spoiler:one of the Istari, and the future Gandalf]].

* ''Series/TheOutpost'': The fact that she's actually Princess Rosmund, the heir to the old kingdom's throne, is revealed early on.

* ''Series/ResurrectionErtugrul'': So much as even mentioning the name Sugay cannot be brought up unless one mentions Halime’s untimely death after giving birth to Osman near the end of the fourth season.

* ''Series/RussianDoll'': Alan revealed to being stuck in the same GroundhogDayLoop with Nadia in Episode 3. It's so disruptive to the events up to that point that the work page has no choice but to untag all spoilers related to this.

** The entire character of [[MeaningfulName Davis Bloome]] pretty much is built around he is the human side of Doomsday. Even the actor name has to be spoilered because the monster is played by a different actor.

** Ash Tyler is actually Voq, Klingon spy with a pretty terrible case of SplitPersonality activated by a Klingon TriggerPhrase. The fact that this is the case was hidden even during production--a pseudonym was used for Voq's actor and Shazad Latif was [[LyingCreator tied to a different Klingon]] during production. Ash Tyler looks human, acts human, and even ''scans'' human enough that specialized Starfleet tests designed to catch TheMole fail to detect two personalities, though Dr. Hugh Culber notices a few physical abnormalities. This [[HeKnowsTooMuch costs him]] [[NeckSnap his life]].

* ''Series/StrangerThings'': Vecna is introduced as the BigBad of Season 4 (and, by extension, [[GreaterScopeVillain the entire series]]). However, it's hard to talk about him without eventually bringing up that he's an alter ego of One, who in turn is an alter ego of Henry Creel. His existence is so spoilerrific that, when new characters were revealed for Season 4, his orderly alter-ego was called "Peter Ballard" (a name that has never been said or written on the show).

** Gien and Captain Ryuya Asami of ''Series/MiraiSentaiTimeranger''. The former ultimately goes insane and becomes the final opponent of the series, killing off the apparent BigBad Don Dolnero. The latter, however, is the true BigBad of the series, having kickstarted the events of the series to save his own life via sacrificing Naoto and leaving the rest of the past to die by Gien's hands. Their counterparts in ''Series/PowerRangersTimeForce'', Frax and Alex, also count, but to lesser extents due to the presence of Ransik, an original character who maintains BigBad status to the end, and the fact that Alex is not a villain like Ryuya.

** All of the events of ''Series/JukenSentaiGekiranger'' are set in motion by Long, who is an immortal dragon god trying to find sick ways of entertaining himself. Most of the time this entertainment involves rampant destruction and death. He was the one who indirectly created the antagonistic faction thousands of years ago and put the current BigBad Rio in charge of it by making him an orphan. The powerlessness of not being able to save his parents caused Rio to become power hungry, to the point of embracing every bit of power he could take his hands on.

** The other two seasons have each had a villain like that. Peter from Season 1 initially appears to be a vegetable in an intensive care facility (having hidden the fact that he's been slowly healing himself), whilst Jennifer from Season 3 initially appears to be a dorky HotTeacher, only revealing that she's the mass murdering dark druid who's been kidnapping and sacrificing people all season.

** John Henry, the innocent child AI who Weaver and her team create and who comes to control the body of the show's original BigBad, the Terminator known as Cromartie.

* ''Series/TwinPeaks'': Who killed Laura Palmer? It's more or less given in the first season and the beginning of season two that it's the mysterious demonic HumanoidAbomination BOB, but BOB just so happened to be inhabiting the body of Laura's father, Leland.

** Pauline Rennie, Big Jim's wife and Junior's mother, thought to have died years prior. It turns out she knew the dome was coming and faked her death in part of trying to spare Chester's Mill.
** There's also Melanie, a girl who shows up at the start of Season 2, and is later to be revealed to be Barbie's half-sister and a girl who was killed 25 years prior to the events of the show. Later during the season, she's shown to have some connection to the dome.

** At first, it seems like Will Reeves was created for the series. Then came "This Extraordinary Being", he was revealed to be [[CanonCharacterAllAlong Hooded Justice]], a character who was ShroudedInMyth in the original comic -- and that Hollis Mason's InUniverse speculation in the original comic was [[AdaptationalBackstoryChange oh]], [[AdaptationNameChange so]] [[SparedByTheAdaptation very]] [[AdaptationalSexuality much]] [[RaceLift wrong]] [[AdaptationalNationality in]] [[AdaptationalJobChange this]] [[AdaptationalHeroism series]].

** Bernard is actually a host based from Ford's dead partner, Arnold, who is killed by Dolores as a mean to shut down the park which is a failed attempt to save the hosts from being abused by humans.
** The Man in Black is an older version of [[NiceGuy William]] who became very cynical of the park. He's also responsible for saving the park from being shut down after Arnold's death and for starting a secret project to collect guest data in preparation of making host-human hybrid as a means to achieve immortality.