History VideoGame / GateKeepers

''Gate Keepers'' started out as a TurnBasedStrategy (with DatingSim elements thrown in) video game for the {{Playstation}} in 1999. A manga was also commisioned as well and both were released in the same month. It was later adapted into an anime series in 2000 by Creator/{{GONZO}} who decided to omit [[PutOnABus one of the main Gatekeepers]] and replace another with another character with a similar design. The setting takes place on Earth, after the end of World War II. In the middle of all that, alien creatures known simply as Invaders are infiltrating Earth and attempting to take over the world by turning humans into soulless robots. The only means to defeat the Invaders is by tapping into powerful energy locked inside dimensional "gates".

''Gate Keepers'' started out as a TurnBasedStrategy (with DatingSim elements thrown in) video game for the Playstation in 1999. A manga was also commisioned as well and both were released in the same month. It was later adapted into an anime series in 2000 by Creator/{{GONZO}} who decided to omit [[PutOnABus one of the main Gatekeepers]] and replace another with another character with a similar design. The setting takes place on Earth, after the end of World War II. In the middle of all that, alien creatures known simply as Invaders are infiltrating Earth and attempting to take over the world by turning humans into soulless robots. The only means to defeat the Invaders is by tapping into powerful energy locked inside dimensional "gates".

* ChineseGirl: Feng Fei Ling (as if that's not obvious enough). Even her invocation was in mandarin.

* TakehitoKoyasu: Bancho

** In the English dub, there are [[HaruhiSuzumiya Wendee Lee]], [[CodeGeass Johnny Yong]] [[PlayingAgainstType Bosch]], and [[TengenToppaGurrenLagann Michelle Ruff]], among other prolific VAs.

* NewTransferStudent: Reiji Kageyama, and Satoka Tachikawa, from ''GK21''. The gatekeepers, barring Ruriko, also apply, as they all had to transfer to AEGIS's combination school/secret base when they join the team.

* TelevisionTieInNovel: ''Gatekeepers 1985'', which bridges the gap between ''GateKeepers'' and ''GK21.''

* UnstoppableRage: Gatekeepers who go into an UnstoppableRage gain "[[ReversePolarity Inverse Gates]]", which do the exact opposite of their original powers. This is deconstructed in ''GK21'' [[spoiler:when the BigBad, whose normal Gate power is to erase things, gets pissed off when Ayane destroys her SoulJar. The last thing she does before fading away is use her Inverse Gate, which causes [[ResetButton everything to go back the way they were]]. Satoka points out the possibility that in her anger, she forgot that the Inverse Gate does the ''exact opposite'' of the regular gate.]]

* ChildhoodFriendRomance: [[spoiler: Ruriko and Shun. They get together and eventually get married. It didn't appear they get married at first since Ayane's middle name is Isuzu, not Ikusawa, but Ayane just changed her name. Mostly out of resentment.]]

''Gate Keepers'' started out as a TurnBasedStrategy (with DatingSim elements thrown in) video game for the Playstation in 1999. A manga was also commisioned as well and both were released in the same month. It was later adapted into an anime series in 2000 by GONZO who decided to omit [[PutOnABus one of the main Gatekeepers]] and replace another with another character with a similar design. The setting takes place on Earth, after the end of World War II. In the middle of all that, alien creatures known simply as Invaders are infiltrating Earth and attempting to take over the world by turning humans into soulless robots. The only means to defeat the Invaders is by tapping into powerful energy locked inside dimensional "gates".

* ShoutOut: [[spoiler: The spitz in episode 18's]] transformation sequence is similar to {{Ultraman}}'s

It also spawned a sequel, ''Anime/{{Gate Keepers 21}}'', set 31 years later. There is also a novel, set in 1985, which helps explain some of the events between the two anime series.

** In the English dub, there are [[HaruhiSuzumiya Wendee Lee]], [[CodeGeass Johnny Yong Bosch]], and [[TengenToppaGurrenLagann Michelle Ruff]], among other prolific VAs.

* ChildhoodFriendRomance: [[spoiler: Ruriko and Shun. Although they do get together, but don't get married. Evidenced by the fact that Ayane's middle name is Isuzu, not Ikusawa.]]
** [[spoiler:Actually, they do get married, Ayane just changed her name. Mostly out of resentment.]]

* VictoriousChildhoodFriend: Subverted by [[spoiler: Ruriko, who gets together with Shun but doesn't go on to marry him. Evidenced by the fact that Ayane's middle name is Isuzu, not Ikusawa.]]
** [[spoiler:Actually, she does marry him, Ayane just changed her name. Mostly out of resentment.]]

** In the English dub, there are Wendee Lee, Johnny Yong Bosch, and Michelle Ruff, among other prolific VAs.

* LadyOfWar: Ruriko, who uses [[TheArcher arrows]], as opposed to Kaoru, who uses her [[CuteBruiser fists]].

* JerkAss: Most of the undercover Invaders are like this in their human disguise. One episode that centers around one shows that this may partly be due to stress as it was mentioned that the invader only started acting like JerkAss shortly before the episode.

* {{Pointless Band-Aid}}: Shun

* JerkAss: Most of the undercover Invaders are like this in their human disguise. One episode that centers around one shows that this may partly be due to stress.

* ChineseGirl: Feng Fei Ling (as if that's not obvious enough)

* JerkAss: Most of the undercover Invaders are like this in their human disguise.

* SuperStrength: Kaoru, who additionally has SuperSpeed, as her Gate power amplifies her physical abilities.

** [[spoiler:Actually she does marry him, Ayane just changed her name. Mostly out of resentment.]]

* NewTransferStudent: Reiji Kageyama, and Satoka Tachikawa, from ''GK21''

It also spawned a sequel, ''{{Gate Keepers 21}}'', set 31 years later. There is also a novel, set in 1985, which helps explain some of the events between the two anime series.

* HeelFaceTurn: [[spoiler:Reiji Kageyama, the BigBad of the original series, is the head of A.E.G.I.S. in ''GateKeepers21''.]]
* HopelessWar: [[spoiler:As explained in ''{{Gatekeepers 21}},'' the invasion is proceeding nicely (over half of humanity has been subverted at that point), there's no way to actually win, and the very power used to fight the invaders will [[EquivalentExchange kill the users. Or worse.]] Ouch.]]

* TheVirus: The Invaders in ''GateKeepers21''.

* HeelFaceTurn: [[spoiler:Reiji Kageyama, the BigBad of the original series, is the head of A.E.G.I.S. in ''Anime/GateKeepers21''.]]

* TheVirus: The Invaders in ''Anime/GateKeepers21''.

* AlternateHistory: It's mentioned that the Invaders were first encountered in 1945. The events that transpire in the show itself, as well as the existence of AEGIS, could also count. Though by 2001 (''Gatekeepers21''), history has more or less become similar to our own, if not worse...[[spoiler: ''[[HopelessWar much worse.]]'']]

* BodyHorror: Two different types, depending on the series. In the case of ''GateKeepers'', the Invaders were sleeper agents, some sleeping so deep that they were horrified by the realization of what they really were. In ''GateKeepers21'', the Invaders are TheVirus.

* HeelFaceTurn: [[spoiler:Reiji Kageyama, the BigBad of the original series, is the head of A.E.G.I.S. in ''GateKeepers21''.]]

* TheVirus: The Invaders in ''GateKeepers21''.

* SexySecretary: Who also happens to be [[HelloNurse the school nurse]].