History Main / LetteredSequel

* The fourth installment of ''[[Franchise/{{Digimon}} Digimon World]]'' video game series is titled ''Digimon World X'' in Japan, but since its tie-in movie, Anime/DigimonXEvolution, [[NoExportForYou didn't see a release in US]], the US version of the game changed the title into ''VideoGame/DigimonWorld4''.

** InUniverse, the name for the Mega Evolution also adds the letter from their game origin, such as Charizard can evolves into Mega Charizard X or Mega Charizard Y.

* In Japan, ''VideoGame/SuperSmashBros'' is known as ''Great Melee Smash Brothers''. The sequels, ''Melee'' and ''Brawl'', are known respectively as ''Great Melee Smash Brothers DX'' and ''Great Melee Smash Brothers X'' (DX stands for Deluxe). The collective fourth installment is named through SuperTitle64Advance instead (''for Nintendo 3DS'' and ''for Nintendo Wii U''), just like the international version.

* In Japan, the ''VideoGame/MonsterHunter'' expansions have letter G added to their original names, alluding to the inclusion of the HarderThanHard G Rank difficulty. For example, the expanded version of ''Monster Hunter 3'' was identified as ''Monster Hunter 3 G''; same for ''Monster Hunter 4'' turning into ''Monster Hunter 4 G'' (in the international releases, WordSequel is used instead; hence ''Unite'' for the expanded second-generation game and ''Ultimate'' for the expanded third and fourth generation games). Uniquely, the next installment is lettered from the get-go: ''Monster Hunter X'', with the G Rank expansion being called ''Monster Hunter XX''.
* The [[ThematicSeries thematic sequel]] to ''VideoGame/XenobladeChronicles'' is called ''VideoGame/XenobladeChroniclesX''.

* ''VideoGame/MetalSlug X'' is an enhanced version of ''Metal Slug 2''. The series went back to NumberedSequels until ''Metal Slug XX'', an UsefulNotes/XboxLiveArcade and PSP port of ''Metal Slug 7''.

* ''Anime/SaberMarionetteJ'' is followed up by ''Saber Marionette J Again'', ''Saber Marionette J to X'', ''Saber Marionette R'' and the manga-only ''Saber Marionette Z''. The letters are the initials of the places where the main characters are located: J stands for Japaness which is based on Japan, R is for Romana which is based on Romania, X means Xian which is based on China, and Z is the oddball as it's the initial of a new starring character, Zero. The first series (''J'') is followed up directly by ''J Again'' and then ''J to X'', whereas ''R'' and ''Z'' are distant sequels.

* ''{{VideoGame/GITADORA}}'' started as ''Guitar Freaks and DrumMania XG'', which was a spinoff of the original series. This was followed by [=XG2=] and [=XG3=] before becoming GITADORA.

* The season sequels of the ''Franchise/DragonBall'' anime series are titled ''Anime/DragonBallZ'' and ''Anime/DragonBallGT''. Z is also used [[{{Woolseyism}} in certain dubs]] to name the protagonists "the Z Fighters", but what Z means or why they'd need a group name for a loosely-affiliated group of friends and rivals is never explained within the show.[[note]]The real-life explanation is that, since the Saiyan and Namek arcs were originally conceived to be the last ones, Toei Animation wanted a name change on the basis that the series was going through a TimeSkip and a change of tone; manga creator Akira Toriyama suggested the name "Dragon Ball Z", as Z was the last letter of the alphabet. Toriyama himself never agreed with a name change to begin with, nor did the aforementioned arcs become the last, so letter Z lost its meaning.[[/note]] GT stands for Grand Tour according to the company.

* The DarkerAndEdgier revival of ''[[Series/UltraSeven Ultraseven]]'' is titled ''[[Series/UltraSevenX Ultraseven X]]'', and the sequel to ''Series/UltramanGinga'' is titled ''Ultraman Ginga S''.

This trope is a title naming convention for sequels, adaptations, or work expansions of a franchise in which they just add a letter or two to set up the name. Sometimes the titles will end in a rather cool sounding letter such as [[XtremeKoolLetterz Z or X]] [[VideoGame/MegaManZX (Or both)]]. [[YNot (But not Y.)]] The letter sometimes stands for something meaningful and relevant to the plot, or just being thrown at random until [[WordOfGod the creator]] explains what it means.

In many video game titles, it commonly overlaps with SuperTitle64Advance for the titles that end in "[[UsefulNotes/NintendoDS DS]]", "[[UsefulNotes/WiiU U]]" or "[[UsefulNotes/{{Xbox}} X]]". Related to OddlyNamedSequel2ElectricBoogaloo, XMakesAnythingCool and StoppedNumberingSequels, not to be confused with OneLetterTitle. See also YNot.

* A Certain Scientific Railgun S is the sequel series to the popular ''Manga/ACertainScientificRailgun'' staring Mikoto Misaka, funnily enough it's sister series ''LightNovel/ACertainMagicalIndex'' used the [[{{NumberedSequels}} Roman Numeral II]] for it's second season.

* The ThematicSequel to ''VideoGame/XenobladeChronicles'' is called ''VideoGame/XenobladeChroniclesX''.

* ''VideoGame/MetalSlug X'' is an enhanced version of ''Metal Slug 2''. The series went back to NumberedSequels until ''Metal Slug XX'', an XboxLive and PSP port of ''Metal Slug 7''.

* The second season of ''LightNovel/HaiyoreNyarkoSan'' anime is called ''Haiyore! Nyarko-San W'', as a reference to ''Series/KamenRiderDouble''.

* ''Maximum Tune 3'' was followed by ''WMMT 3 DX'', which added a few new cars, one new song, a new course, and 20 more stages (as if 80 wasn't enough!). And then ''WMMT 3 DX Plus'', which adds yet another course, more cars and four new songs (two of which are remixes).

This trope is a title naming convention for sequels, adaptations, or work expansions of a franchise in which they just add a letter or two to set up the name. Sometimes the titles will end in a rather cool sounding letter such as [[XtremeKoolLetterz Z or X]] [[MegaManZX (Or both)]]. [[YNot (But not Y.)]] The letter sometimes stands for something meaningful and relevant to the plot, or just being thrown at random until [[WordOfGod the creator]] explains what it means.

* The season sequels of the ''Franchise/DragonBall'' anime series are titled ''Anime/DragonBallZ'' and ''Anime/DragonBallGT''. Z is also used [[{{Woolseyism}} in certain dubs]] to name the protagonists "the Z Fighters", but what Z means or why they'd need a group name for a loosely-affiliated group of friends and rivals is never explained within the show. GT stands for Grand Tour according to WordOfGod.
** WordOfGod is that when Toei wanted to do a soft-reboot of the DragonBall anime, they didn't know what to call it, as it was a continuation, obviously, but also marked a point where the tone & setting changed dramatically following the TimeSkip. Toriyama said he wanted it to be called DragonBallZ, because Z, being the last letter of the alphabet, signified it was near the end... And then the "Z" part of the series went on for even longer than the "Dragon Ball" part.

* Music/{{AKB48}} has the sub-group for celebrating [[UsefulNotes/JapaneseHolidays Natto Day]] named Natto Angels. In 2010, however, the group had been replaced entirely different members save for Miyazaki Miho, and changed the name into Natto Angels Z.
** The entire 48 Family also spawned a handful of team units based on their original group such as Team A, Team K and Team B (for [=AKB48=]), Team N, Team M and Team BII (for Music/{{NMB48}}). There is an one-shot joint unit from the family named Team Z.

* The successor of Nintendo console UsefulNotes/{{Wii}}, UsefulNotes/WiiU. No one knows what U stands for, but the common interpretation is "[[CaptainObvious You]]".

* In Japan, ''VideoGame/SuperSmashBros'' is known as ''Great Melee Smash Brothers''. The sequels, ''Melee'' and ''Brawl'', are known respectively as ''Great Melee Smash Brothers DX'' and ''Great Melee Smash Brothers X'' (DX stands for Deluxe).

** The entire 48 Family also spawned a handful of team units based on their original group such as Team A, Team K and Team B (for AKB48), Team N, Team M and Team BII (for Music/{{NMB48}}). There is an one-shot joint unit from the family named Team Z.

This trope is a title naming convention for sequels, adaptations, or work expansions of a franchise in which they just add a letter or two to set up the name. Sometimes the titles will end in a rather cool sounding letter such as [[XtremeKoolLetterz Z or X]]. [[YNot (But not Y.)]] The letter sometimes stands for something meaningful and relevant to the plot, or just being thrown at random until [[WordOfGod the creator]] explains what it means.

* MicrosoftWindows
** Microsoft has Windows ME, "ME" stands for Millennium Edition. it's the last of the MS-DOS based Windows 9N line, where the names were appended with the release year instead (1995 & 1998).
** The next ones were the Windows NT line, where NT stands for Intel i860's codename, N10. but was simply expanded to "New Technology" for marketing purposes.
** The last is Windows XP, XP there means "eXPerience" as in "User Experience", to highlight it's supposedly enhanced user experience.

* Every ''VideoGame/MetalSlug'' ports and updated rerelease from their arcades, ''Metal Slug X'', that actually is a Main/PlayStation port of ''Metal Slug 2'', and ''Metal Slug XX'' is a PSP version of ''Metal Slug 7''.

* ''VideoGame/MetalSlug X'' is an enhanced version of ''Metal Slug 2''. The series went back to NumberedSequels until ''Metal Slug XX'', an XboxLive port of ''Metal Slug 7''.

* The DarkerAndEdgier revival of ''[[Series/UltraSeven Ultraseven]]'' is titled ''[[Series/UltraSevenX Ultraseven X]]''. A straighter example would be the sequel to ''Series/UltramanGinga'' which was titled ''Ultraman Ginga S''.

** In the newer series ''Series/KamenRiderDouble'', the title alternatively uses the letter W.

* The DarkerAndEdgier remake for ''Series/UltraSeven'' is titled ''Series/UltraSevenX''.