'''Menburen no Tsuinzu''' ('''メンブレンのツインズ'''; officially called '''Twinsane in the Membrane''' in English) is a video crossover fanfic released on Christmas Day in 2010. Originally intended as a bonus treat for the Spyro Era (which has since been cancelled), it is now best remembered for serving as the basics for it's spiritual "prequel", ''[[Fanfic/BadAlertTheExtreme Bad Alert: The Extreme]]''. The song used is a remix of the Evil Twins theme from ''VideoGame/CrashTwinsanity''.

The video is a crossover between ''VideoGame/KingdomHeartsII'' and ''VideoGame/RatchetAndClankUpYourArsenal''. Though mainly a random plot story being shown to the viewer by a Water Wizard, the main telling appears to be Dr. Nefarious trying to steal Christmas from everyone, but the effects of Sora and Ratchet were able to cancel this out.

Is actually the second of three videos considered part of the "Mystic Marsh Holiday Trilogy".

The author is seriously considering on remaking the video to a more suitable story tone and using HD graphics. The planned remake will retain the five protagonists and the song but it will be completely overhauled into a better story, with the Water Wizards to be adapted out and replaced with scenes from ''VideoGame/Sly2BandOfThieves''. The new version of the video's title is planned to be '''最終的なアップデート: メンブレンのツインズ''' ('''Saishū-tekina Appudēto: Menburen no Tsuinzu'''), or, ''' The Remixed: Twinsane in the Membrane''' in English. However, it is currently in DevelopmentHell due to other contracts, and due to OldShame towards the other videos.

!Tropes relating to this video
* ArchNemesis: Dr. Nefarious to Qwark and Ratchet; Neyla to Sora and Carmelita.
* BigBad: Dr. Nefarious in the original version
** BigBadEnsemble: The remixed version retcons Neyla into a second villain with a role nearly equal to Dr. Nefarious.
* BilingualBonus: The name of the video translates to "Twins of the Membrane", reflecting Victor and Moritz of the ''Crash Bandicoot'' series.
* TheCameo: [[spoiler:Luna]].
** [[spoiler:Arpeggio in the remixed version]].
* ChristmasEpisode: The only one ever made before [=GastrodonAmy=] went into hiatus in 2013.
* FisherKingdom: Sora, Donald and Goofy only appear in their Christmas Town forms in this video [[spoiler:except for the Nefarious confrontation scene, where they are shown in their Halloween Town forms for a few seconds]]. Ratchet also only wears his Aegis Mark V armor [[spoiler:until the ending scene with Luna]].
* OurVampiresAreDifferent / BadassSanta: Sora's a pseudo version of these tropes. He spends the entire video as a vampire, but is only shown in a black Santa outfit [[spoiler:except in one scene]]. The remixed version shows him in his Halloween Town outfit in quite a few scenes.
** Neyla is hinted to be this in the remixed version.
* {{Retcon}}: The remixed version will change the video pattern to make the story more clear, but the water wizards and [[spoiler:Luna]] will be removed, Neyla will be made into a major character as a second villain and Jack Skellington will be given a larger role. [[spoiler:The video's ending will be changed back to it's original version, with Clank destroying the Biobliterator]].
* SequelHook: [[spoiler:[[VideoGame/RatchetAndClankSizeMatters Luna]]]] makes a cameo appearance at the end, which causes a HereWeGoAgain moment for Ratchet and Clank. The video was originally supposed to end with Clank teasing Dr. Nefarious and destroying his Biobliterator, but this was changed into a sequel hook for a video that would respond to ''Film/TronLegacy''. Given the cancellations of ''TRON 3'' and (maybe) the planned ''Sly Cooper'' film, Ms. Gastrodon has since stated her regret for the change.
* SparedByTheAdaptation: [[spoiler:Although Clockwerk's body does appear, the video never shows Neyla going into it, as her last scene at the very end shows her running out of a bank just as the Biobilterator is destroyed by Clank]].