History Trivia / MetroidFusion

** The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and had several gameplay mechanics that didn't make it into the finished game, including it apparently taking place on a moving space ship rather than a station, and Samus having the ability to walk on walls (possibly inspired by the Spider Ball from ''VideoGame/MetroidIIReturnOfSamus''). The trailer drew a great deal of criticism for looking like it belonged more on the UsefulNotes/GameBoyColor than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.

* WhatCouldHaveBeen: The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and had several gameplay mechanics that didn't make it into the finished game, including it apparently taking place on a moving space ship rather than a station, and Samus having the ability to walk on walls (possibly inspired by the Spider Ball from ''VideoGame/MetroidIIReturnOfSamus''). The trailer drew a great deal of criticism for looking like it belonged more on the UsefulNotes/GameBoyColor than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.

* FanNickname:
** The nigh-unskippable Missile Tank in Sector 3, making a [[MinimalistRun 0% run]] almost impossible, is nicknamed "Bob".
** The Varia Suit's much-maligned colour scheme is derisively called "Mustard Samus" by some fans.
** The orange suit Samus gets upon absorbing the SA-X has no official name, but it's usually called the "Omega Suit" due to it being an EleventhHourSuperpower and due to it being used in the fight against the Omega Metroid.

** The XenomorphXerox creatures found in the Main Deck and Sector 1 have no official English name, but they are commonly called "Genesis" by fans as a Romanization of their Japanese name.

* WordOfDante: In official media, the only ''Fusion'' enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom (including major ''Metroid'' fan websites such as Metroid Database, Metroid Recon, Wikitroid, and Metroid Wiki) that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Geemer-X, etc.). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon. Notably, ''VideoGame/MetroidDread'' does not use this naming scheme (e.g. [[spoiler:Chozo Soldiers]] are never called [[spoiler:Chozo Soldier-X]] on the Map or Mission Log screens), with one single exception: [[spoiler:Raven Beak X]], but even its name differs slightly from SA-X in that it is not hyphenated.

* WordOfDante: In official media, the only ''Fusion'' enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom (including major ''Metroid'' fan websites such as Metroid Database, Metroid Recon, Wikitroid, and Metroid Wiki) that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Geemer-X, etc.). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon. Notably, ''VideoGame/MetroidDread'' does not use this naming scheme (e.g. [[spoiler:Chozo Soldiers]] are never called [[spoiler:Chozo Soldier-X]]), which seems to further enforce its status as unofficial fanon instead of official canon.

* WordOfDante: In official media, the only ''Fusion'' enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom (including major ''Metroid'' fan websites such as Metroid Database, Metroid Recon, Wikitroid, and Metroid Wiki) that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Geemer-X, etc.). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon.

** There are unused sprites of the Scientist getting blown to the side upon getting shot. In the final, unaltered game, the Scientist calmly turns to the side before reverting to a Core-X.

** There are several rooms leftover in the game. In the Debug Room, you can find sprites from ''VideoGame/WarioLand4''. The reason for this is because this game is built on a heavily modified version of that game's engine. There's also a modified Neo Ridley arena made to resemble his arena from ''Super Metroid''.
** The Debug Menu is left intact, but it requkres cheats to access. Much like ''Super'', you can toggle which upgrades to have on and/or off, like having ''just'' the Charge and Ice Beam.

** In the game's hidden Debug Room, you can find sprites from ''VideoGame/WarioLand4''. The reason for this is because this game is built on a heavily modified version of that game's engine.
** The Debug Menu is still left intact, but it cannot be accessed through normal gameplay. Cheats have to be involved to access it. Much like ''Super Metroid'', you can toggle which powers to have on and/or off, like having ''just'' the Charge and Ice Beam.

* {{Jossed}}: To reconcile the differences between the Omega Metroids in ''VideoGame/MetroidIIReturnOfSamus'' and ''Fusion'', it became a popular fan theory that the Omega Metroid in ''Fusion'' was genetically altered by the Galactic Federation to be larger, but artificially speeding up its metamorphosis came with the side effect of losing natural traits such as flight and Ice Beam immunity. This theory was ultimately disproven by ''VideoGame/MetroidSamusReturns'', which retconned the original ''Return of Samus'' by showing that Omega Metroids are naturally large, flightless, and vulnerable to the Ice Beam.

* WhatCouldHaveBeen:
** The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and drew a great deal of criticism for looking like it belonged more on the UsefulNotes/GameBoyColor rather than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.
** On the same trailer, its shown Samus was going to able to walk through walls (possibly inspired by the Spider ball from ''Videogame/MetroidIIReturnOfSamus''), but this was scrapped in the final game.

** On the same trailer, its shown Samus was going to able to walk through walls (possibly inspired by the Spider ball from ''Videogame/Metroid2ReturnOfSamus''), but this was scrapped in the final game.

* WhatCouldHaveBeen: The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and drew a great deal of criticism for looking like it belonged more on the UsefulNotes/GameBoyColor rather than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.

* WordOfDante: In official media, the only ''Fusion'' enemy with "-X" attached to the end of its name is the SA-X. Yet, it seems almost universally accepted among the fandom that creatures infected and/or mimicked by the X parasites follow that naming scheme (Hornoad-X, Geemer-X, etc.). It's not clear if this originates from an obscure official source or if it is simply fanon that has become so well known that it's nearly indistinguishable from canon.

* GodNeverSaidThat: When ''VideoGame/MetroidSamusReturns'' was released, some fans cited a [[TheyWastedAPerfectlyGoodPlot wasted opportunity]] to make a CallForward by showing bosses from ''Fusion'', such as Serris and Yakuza, in their natural habitat. However, only the creatures seen in Sector 1 are canonically native to [=SR388=]; most bosses[[note]]which, with the exception of Neo-Ridley, are all encountered outside Sector 1[[/note]] are of unknown origin. This confusion seems to stem from the fan-made ''VideoGame/AnotherMetroid2Remake'', which includes Serris as a boss and provides lore referring to it as the apex aquatic predator of [=SR388=].

** The [[Franchise/{{Alien}} xenomorph]]-esque creatures found in the Main Deck and Sector 1 have no official English name, but they are commonly called "Genesis" by fans as a Romanization of their Japanese name.
** [[spoiler:The orange suit Samus gets upon absorbing the SA-X has no official name, but it's usually called the "Omega Suit" due to it being an EleventhHourSuperpower and due to it being used in the fight against the Omega Metroid.]]

* FanNickname: The nigh-unskippable Missile Tank in Sector 3, making a [[MinimalistRun 0% run]] almost impossible, is nicknamed "Bob".
* WhatCouldHaveBeen: The 2001 E3 preview, at that point simply titled ''Metroid IV'', looked quite different and drew a great deal of criticism for looking like it belonged more on the UsefulNotes/GameBoyColor rather than the UsefulNotes/GameBoyAdvance. With that feedback, Nintendo went back to the drawing board, and at the next year's E3 ran a preview looking much more like the finished game.

* FanNickname: The nigh-unskippable Missile Tank in Sector 3, making a [[MinimalistRun 0% run]] almost impossible, is nicknamed "Bob".

* FanNickname: The nigh-unskippable Missile Tank, making a [[MinimalistRun 0% run]] almost impossible, is nicknamed "Bob".