->"''Sure as day follows night, sure as eggs is eggs, sure as every odd-numbered ''Franchise/StarTrek'' movie is shit.''"
-->-- '''[[Series/{{Spaced}} Tim Bisley]]''', played by '''Creator/SimonPegg''', [[HilariousInHindsight who starred in]] [[Film/StarTrek the eleventh Star Trek movie]], and noted the irony.

As a series or franchise goes on and the number of sequels and side works/{{Spinoff}}s/etc. increases, it's all but certain that the audience will not find them to all be of uniform quality. However, there are a number of works that show this in one particular way: audiences will generally find that the quality bounces back and forth in a numerically ordered fashion. Typically, this will show up as either the even- or odd-numbered sequels being better than the opposite, although other variants exist.

The TropeCodifier is the ''Film/StarTrek'' movies, which have had a long-standing reputation of "the even-numbered movies are a lot better than the odd-numbered ones".


[[AC:{{Anime}} and {{Manga}}]]
* For ''Franchise/{{Gundam}}'', it's the "sequel series curse", where sequels to a series other than the original ''MobileSuitGundam'' tend to be poorly recieved in comparison: ''ZetaGundam'' and ''GundamZZ'', ''GundamSeed'' and ''GundamSeedDestiny'', and to an extent the second season of ''{{Gundam 00}}''. Averted with ''GundamWing'' and ''Endless Waltz''. For the moment appears to be downplayed with ''GundamBuildFighters'' and ''GundamBuildFightersTry'', with BF being a ToughActToFollow but reactions to ''Try'' still being generally positive, if not to the degree of its predecessor.
* Fan consensus on the ''Manga/OnePiece'' movies tends to favor the even-numbered movies over the odd-numbered ones, with the exception of the eighth movie "Episode of Alabasta" and the ninth movie "Episode of Chopper" which are reversed.

* ''Franchise/StarTrek'': In the 20th century, the page-naming Curse was fairly consistent (to the point where ''Insurrection's'' crew made a point of calling the film "Nine of Ten" on set to stave off the odd number's influence, not that it helped). But this century the Curse seems to have gone off the rails -- 2002's ''Film/StarTrekNemesis'' flopped while 2009's ''Film/StarTrek'' was a hit, contrary to their positions in the series. It is unknown whether this anomaly means the Curse has actually been broken, or merely inverted.
** Among those who do consider ''10'' bad and ''11'' good, there are several commonly proposed methods to realign the curse with "reality". One is using the sum of the digits as an indicator, or alternatively including the AffectionateParody ''Film/GalaxyQuest'' as a ''Star Trek'' movie, inserting it between 9 (''[[Film/StarTrekInsurrection Insurrection]]'') and 10 (''Nemesis''), as [[http://qntm.org/odd put by]] [[Website/ThingsOfInterest Sam Hughes]]. Another theory states that ''Nemesis'' wasn't good because it was a multiple of five, and thus, like ''Film/{{Star Trek V|The Final Frontier}}'', was bad; in other words, the curse has a previously-undiscovered [[http://en.wikipedia.org/wiki/Fizzbuzz FizzBuzz property]]. This is followed by the excuse that ''Film/StarTrek'' doesn't follow the pattern because of the interference of [[HandWave time-traveling Romulans]] -- besides, it wasn't made by the same crew as the rest. Some have also taken to referring the [[ContinuityReboot reboot]] film as "''Star Trek 0''," thus placing it in an arguably even spot.
** Michael Demtschyna, along with Chuck Sonnenburg of Website/SFDebris, have suggested the alternate theory that the movie is bad when any of the main characters sing. These are ''The Final Frontier'', ''Generations'', ''Insurrection'', and ''Nemesis'' (with Chuck snarking that ''Film/StarTrekTheMotionPicture'' doesn't contain singing only because [[LeaveTheCameraRunning it would distract from the boredom]]).
** Some argue that the curse didn't start until SiskelAndEbert listed ''Film/StarTrekVTheFinalFrontier'' among the ten worst movies of 1989. ''Film/StarTrekTheMotionPicture'' was financially successful allowing for a sequel, and ''Film/StarTrekIIITheSearchForSpock'' accomplished its two primary purposes, [[spoiler: resurrect Spock, so they could make more movies]], and to establish LeonardNimoy's credentials as a competent film director.
** The pattern of the ''Star Trek'' films is [[http://www.egscomics.com/index.php?id=357 referenced]] in ''Webcomic/ElGoonishShive'', where Susan has shelved the odd and even numbered films separately in the rental store she works in.
** The following film, ''Film/StarTrekIntoDarkness'', muddies the waters even further; it was successful critically and financially, but the fanbase loathed it.
* The ''Franchise/IndianaJones'' franchise seems to be the opposite; odd-numbered movies (''Film/RaidersOfTheLostArk'', ''Film/IndianaJonesAndTheLastCrusade'') do well, while even-numbered movies (''Film/IndianaJonesAndTheTempleOfDoom'', ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull'') are nowhere near as good.
* Many fans consider the ''Franchise/ANightmareOnElmStreet'' series to follow the reverse of this, with the even number movies being inferior to the odds. Hilariously, it is still inverted to ''Star Trek'' with regard to reboot status, as the ''Nightmare'' reboot is considered poor by most fans, unlike the mostly acclaimed ''Star Trek'' 2009 reboot.

* While fans of the ''Literature/{{Temeraire}}'' series of books don't necessarily find the even-numbered books to be bad, there is definitely a pattern of odd being "war and lots of cool dragon battles" and even being "travel and lots of talking". However, both the sixth and seventh books are travel and diplomacy, and the eighth is Napoleon's Russian campaign.

* So far this seems to be the case with ''Series/AmericanHorrorStory''. ''Asylum'' and ''Freak Show'' (even-numbered) have been better-received than ''Murder House'' and ''Coven'' (odd-numbered). Something to note is that ''Asylum'' and ''Freak Show'' take place in the past (1964 and 1952 respectively, although ''Asylum'' did flash to the present occasionally), while the others are set in the present-day.
* ''Series/{{Supernatural}}'' has been following the trope to a tee. Although the show has had its bases regularly broken as early as the ''third'' season, it seems to be agreed upon most fans that the odd seasons are better. Season 1 is regarded as a decent start but suffers from a large amount of MonsterOfTheWeek episodes as the show was still finding its footing, while season 2 is noted as the show's real moment of GrowingTheBeard. Season 3 wound up being hit by production troubles thanks to the '07 Writers Strike and also introduced two new characters [[SpotlightStealingSquad that took time away from Sam and Dean]] and were Base Breakers ''at best''. Season 4 wound up introducing [[BreakoutCharacter fan favorite Castiel]] and heavily increasing the mythology marking a notable increase in the show's ratings, while Season 5 is a downplayed case as it is overall liked, but fans do have some problems with it, particularly the finale, which has come off as an AntiClimax to some. Season 6 marks a rare aversion of OnlyTheCreatorDoesItRight as after a controversial beginning wound up having several fan-favorite episodes produced back to back with some major [[HolyShitQuotient HSQ]] thrown in by the end. Season 7 then [[TheyWastedAPerfectlyGoodPlot immediately threw that potential out the window]] in favor of a heavily disliked RandomEventsPlot. Season 8 attempted to fix 7's faults, and after a rough start managed to introduce a well received plotline of the brothers trying to close Hell, but 9 came in and introduced yet ''another'' RandomEventsPlot that wound up turning as many people back off, with Sam and Dean's constant fighting doing little to help as it's started to come off more as {{Wangst}} to many longtime viewers. Time will tell if season 10 follows this standards and is seen as an improvement.
* Fans of ''Series/TwentyFour'' have noted that odd-numbered seasons are generally the show's better ones, featuring a variety of different terrorist scenarios, while the even-numbered ones always revolve around nuclear terrorism and are generally greatly inferior (except for possibly season 2, which is considered to have a solid core storyline, but let down by the subplot involving [[TrappedByMountainLions Kim constantly being taken prisoner]]).
* ''Franchise/PowerRangers'' fans have an unique version with anniversary seasons ''[[Series/PowerRangersTurbo Turbo]]'' (Season 5), ''[[Series/PowerRangersWildForce Wild Force]]'' (Season 10), ''[[Series/PowerRangersOperationOverdrive Operation Overdrive]]'' (Season 15) and ''[[Series/PowerRangersMegaforce Super Megaforce]]'' (the 20th anniversary celebration but [[SequelNumberSnarl don't ask the exact season number]]) considered among the worst or most divisive.

* The odd-numbered Music/LudwigVanBeethoven symphonies are the classics (3, 5, 7, and 9. 1, not so much), whereas the evens (except for 6) don't get as much attention.

* The ''Franchise/AceAttorney'' series has two different variants of this trope:
** Firstly, the odd-numbered entries (''Phoenix Wright: Ace Attorney'', ''Trials & Tribulations'' and ''Dual Destinies'') are generally considered to be the stronger ones, while the even-numbered ones (''Justice for All'' and ''Apollo Justice: Ace Attorney'') are considered to be weaker. The two ''Ace Attorney Investigations'' games generally aren't counted towards this, as the second one has yet to be released outside Japan (and, in all likelihood, [[NoExportForYou never will be]]). Though for those who do the first is usually considered to be on the "weaker" side and the second on the "stronger" side, which makes the order problematic.
** Secondly, fans have noted that the third case in any given game usually tends to be the worst, mostly due to the overwhelmingly hated third cases in (ironically enough) the second and fourth games. ''Dual Destinies'' is the major exception, as most seem to regard the second case as the weakest; some fans also feel that the first game's first case is weaker than the third, for essentially being a glorified tutorial which doesn't even fully explain the game mechanics.
*** Since the release of the Investigation 2 FanTranslation,it seems to have completely inverted both cases,since fans trend to think that the game is much better than the first AceAttorneyInvestigations,and the third case is actually considered the best by some fans.

* ''Webcomic/SurvivorFanCharacters'', especially later on, follows a trend opposite that of Star Trek: The odd-numbered seasons are quite popular while the even-numbered seasons get lukewarm receptions at best. The author himself has noticed, and hopes season 14 will break the pattern.

* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' seems to be following this so far. While season 1 is by no means considered ''bad'', it suffered from EarlyInstallmentWeirdness and a much more restrictive [[AnAesop Aesop]] format. Season 2 is generally considered to be where the show [[GrowingTheBeard grew the beard]] (although it had far more controversial episodes than season 1 did), but was followed by season 3, which is the most controversial and poorly received so far ([[BaseBreaker especially the finale]]). Then season 4 was mostly well-received ([[HolyShitQuotient especially the finale]]).

* MicrosoftWindows has had the curse since Windows 3.1, at least when it comes to their major public releases. Windows 98, Windows XP, and Windows 7 have all been popular, while Windows 95, Windows ME, Windows Vista, and Windows 8 all made rather controversial changes, were unstable, or had other problems which made it difficult to recommend upgrading. (Even the UnFavorite releases have their fans, of course.) Windows releases tend to follow a pattern of "revolutionary" - in which many changes are made at once - followed by "evolutionary", or mostly polishing what was in the last one. Thus, every other version has a lot of new bugs ''and'' new features, and takes some getting used to; by the time the next version comes out, these issues have mostly been resolved (by patches and service packs for the software, and by users getting used how it looks and works). Another way of looking at it is that Microsoft puts out a "public beta", followed a couple of years later by the final, mostly-working-as-advertised version, charging their customers for both (and for the privilege of testing their software for them).
** Microsoft have announced that the follow-up to Windows 8 will be called Windows 10. Some detractors have suggested this means they're skipping the next good version and going straight to another broken mess.