* This is a ''very'' common phenomenon on Website/YouTube, due to their often draconian policies regarding copyright and [[NoExportForYou localization]], as well as their clunky maintenance of content (unsurprising given the sheer, overwhelming volume of videos that they host). Full series playlists are almost always a crapshoot, especially if it's a LongRunner (such as WebVideo/TheAngryVideoGameNerd), and ''especially'' if it's fan-made. For the most part, you're better off referring to the creator's website if you want access to a gapless catalog.
* Several early ''WebVideo/{{lonelygirl15}}'' videos have been removed from the official listing (in some cases, probably due to copyright infringement); namely, "First Blog / Dorkiness Prevails", "School Work in Summer... BLECHH!!!", "Grillz feat. Danielbeast, [=LG15=], P. Monkey and O'n.", "Proving Science Wrong", "My Lazy Eye (and P. Monkey gets Funky!)", "The Tolstoy Principle (and Dad "talks" to Daniel)" and "Daniel, Be Careful". The videos are referenced on numerous occasions in later episodes and still viewable on [=YouTube=].
** The later series 1 episode "Uncle Dan (D-Bone Remix)" is missing from both [=lg15.com=] and [=YouTube=], but is viewable on Revver.
* The earliest portions of the ''LeagueOfIntergalacticCosmicChampions'' were erased from the web (although various posters had offline copies of most of it), the copies were later put up on a GeoCities site.
** Thanks to Yahoo shuttering GeoCities in 2009, it is now gone again from the web.
* Most of the first season of ''LoadingReadyRun'' is unavailable; in the early days, videos would be phased out to make room for newer ones (this was before the existence of [=YouTube=]). Most of the episodes have not been reposted, due to some of them having copyrighted music, the crew being busy with other things, and that most of them [[OldShame were just plain bad]].
* ''CUT!'', a SlenderMan blog that was distinguished by its heavy use of GallowsHumor, has been wiped clean of entries.
** The success of MarbleHornets [[FollowTheLeader led to the creation]] of ''dozens'' of parodies and original vlogs, many of which were subsequently abandoned (for a variety of reasons) and removed. A list of dead/inactive series can be found [[http://slenderversemedia.tumblr.com/post/22318540237/finished-inactive-dead-blogs-vlogs here]] and [[http://slenderverse.wikia.com/wiki/List_of_Slenderseries here]].
* [[LimyaaelsFantasyRants Limyaael's]] first Faean novels, the Orlath trilogy, were taken down from Fiction Press due to someone plagiarizing them (Or something). Which is a real shame, because what little is known about the plot of those novels, both through Limyaael's comments and the other novels taking place in the same universe, seem to indicate that the trilogy was an absolutely '''brilliant''' DeconstructiveParody of cliched fantasy.
* Some {{Creepypasta}}s are based on this kind of thing. Some examples include "[[TheSimpsons Dead Bart]]", "[[MickeyMouse Suicide Mouse]]", "[[SpongebobSquarepants Red Mist/Squidward's Suicide]]", "[[Webcomic/AxisPowersHetalia Hetalia: Episode 23.5]]", and "DarthWiki/CandleCove" (which is technically a lost SERIES rather than a lost episode).
* ''Webcomic/DrawYourOwnStory'' episode 1-9 and a good chunk of episode 10, due in part to moderators deleting old threads on the forum where they were hosted, and in part due to the site being hacked and a lot of uploaded files (i.e. images that made up episode 10) ending up lost forever. What little we know of them is pieced together from memories as well as old episodes still on the contributors' hard drives.
* Several writers of the ''original'' Roleplay/DarwinsSoldiers RP on Furtopia played out scenes via private messaging. Those scenes were never released.
* Game music podcast NitroGameInjection has two missing episodes: #6, which happened but wasn't recorded, and #54, which [=KyleJCrb=] isn't sure [[UnInstallment ever actually happened...]]
* An early website for ''Ride/BackToTheFutureTheRide'' featured a tour of Doc Brown's institute. One page contained some clever blueprints of Doc's post-trilogy inventions, including a personal time travel suit, a hover-bike, and an improved Mr. Fusion. Sadly, the Internet Archive only saved [[http://wayback.archive.org/web/*/http://www.universalstudios.com/unicity/btf/archive.html two captures]] of the blueprints section, and neither one successfully captured all of the blueprints.
* The ViralMarketing sites for ''Film/{{District 9}}''[[note]] including D-9.com (where visitors could view a satellite map of District 9 and receive "news alerts" of suspicious non-human activity), an extensive MNU corporate website, and a Prawn activist blog run by Christopher Johnson[[/note]] have been lost completely. The unofficial [[http://d9.wikibruce.com/Home wiki]] captured a few screenshots and preserved some of the information in text form, but anything added to the sites after 2008 was lost.
* WebVideo/TheNostalgiaChick's first livestream, which was unrecorded.
** Ellis took down her review of Film/{{Dune}} after considerable criticism was leveled at her unprofessional behavior in it, and soon thereafter posted an apology video in which she admitted to letting her dislike for the movie lead to not treating it with her normal standards of conduct. [[http://lostmedia.wikia.com/wiki/The_Nostalgia_Chick_Episode_%22Dune,_yo%22_%282010%29 As of Sept. 2014, the video can now be found through the Lost Media wiki.]]
* The website [[http://www.romhackers.org/modules/news/ PO.B.R.E.]] is dedicated to archiving translation and romhacks in Brazillian Portuguese. Unfortunately, the are a few [[http://www.romhackers.org/modules/smartsection/item.php?itemid=64 missing translations]].
* Pornographic pay websites often have some videos that simply vanish after a while. Reasons vary, from the video being unpopular to unforeseen legal troubles to the girl turning out to be underage, but one rather heartwarming example is the "Sandra" episode from the famous ''Bangbus'' site. The reason Sandra's video disappeared from the site? [[RomanceOnTheSet She and the webmaster got married!]]
* The first episode of ''IncognitoCinemaWarriorsXP'' (''Bride of the Gorilla'') is no longer available for order or download: a combination of [[EarlyInstallmentWeirdness format changes in subsequent episodes]], dissatisfaction with the quality of the episode and a lack of desire to redo it in the current format.
* ''WebVideo/TheCinemaSnob'' episode on ''Grizzly II''. The movie itself was unfinished and thus never commercially released. The film's producer found the review and ordered it taken down. Since Fair Use laws become extra muddy with unreleased material, Brad complied and took it down. (Although his review can be found on youtube.)
* ''WebVideo/BrowsHeldHigh'' episode on ''TheGirlfriendExperience'' was made before Oancitizen joined TGWTG, and it was reposted on the site when he was too busy to make new episodes. Problem was, that on the initial run, the show was known by few people, and most of them friends, so no one pointed out the sexist undertones in many jokes. On the site, several fans got angry, which led to Oancitizen removing the video from his account, and recording a commentary apologizing for it. And the less we say about ''Shit TGWTG Fans Say'', the better...
** And now his episode on Crispin Glover's ''What Is It?'' is gone. Though for reasons similar to the Cinema Snob example above, the movie has no commercial release and is only allowed to be played at private screenings with Glover's presence.
* ''LetsPlay/TheRealGoldenGamer's'' ''You Probably Won't Make It'' Let's Play.
* Jack Douglass of JacksFilms included a "Tool of the Week" segment (in which he criticized and mocked a fellow [=YouTuber=]) in an early installment of his ''Featured Fridays'' videos. Viewers complained about the uncharacteristically mean-spirited tone of the segment, and Jack removed the video several days later with an [[http://www.youtube.com/watch?v=HjrInE5qpvw apology]], admitting that he was just trying to be "edgy".
* Although listing all the cities would take up several pages, GoogleStreetView's coverage of England 2008-2009 for cities in the United Kingdom have disappeared, leaving us with only 2012 pictures of places like Salford, Middleton etc. and not the UnintentionalPeriodPiece ones from 2008-2009 - which are themselves ''an important primary source for historians and students''.
* Some posts from Webcomic/HyperboleAndAHalf have been removed. Allie, the creator, explained this is is either because they contained information that might make real people in the stories uncomfortable or just because she finds them [[Main/OldShame embarrassingly bad]].
* The Website/ItGetsBetterProject has a couple:
** The [[UsefulNotes/NationalFootballLeague San Francisco 49ers]]' video was taken down after two players, in the heat of the controversy surrounding Chris Culliver's homophobic remarks, denied ever making the video, and when reminded of its existence, said they did it under false pretenses.
** Oscar Pistorius' video was taken down after he was charged with murdering his girlfriend.
* [[http://www.youtube.com/user/CNHubNicktoons CNHubNicktoons]] has more than a few.
** A re-upload of the Dr. Mario Song from brentalfoss, removed after 11 months due to complaints in Feb, 2013. The file is still in Homestar SB 9 (aka LOL it on here)'s computer.
** All of the Adventures of Slinky videos from I Am Bagel, due to the fact that they weren't scripted. The only trace of it left is on [[http://www.youtube.com/watch?v=DM6VcskHPYA this video]] and the CN/Hub/Nicktoons on YouTube block on the livestream channel. There was a article of it on Nick Fanon but it brings up a deleted article.
*** As of November 8, 2014, the whole Slinky series has been deleted with the entire "CNHubNicktoons on YouTube" block being removed completely for a major rebrand of the LiveStream channel and the video being deleted, making the whole series lost.
** All of MattBoo's videos were removed by May 2014 due to many videos being deleted from CNHubNicktoons by an unknown offender, driving him to quit and remove all remaining videos he did so he could move to [[https://www.youtube.com/channel/UCCUHn7Axht5pCU64VADnwgg his own channel.]] Only three select videos still live, albeit on MattBoo's new channel, two of which are unlisted and are only accessible by an announcement video. Some other videos survive on his PC but he has no plans to upload them.
*** The aforementioned three videos were also taken down on February 13, 2015 to avoid copyright strikes and [[OldShame MattBoo hating a select couple]], making the last traces of the original CNHubNicktoons extinct.
*** On May 2013, when Flipnote Hatena was ending, MattBoo uploaded many of his flipnotes to CNHubNicktoons. When the videos were removed by an anonymous user as mentioned above, the flipnotes were included. The only way to access them is on Sudomemo ([[KeepCirculatingTheTapes well, some of them, anyways)]].
* The LetsPlay/MarioPartyTV players have made mention of 'lost episodes', gameplays that for one reason or another was either not uploaded onto the channel or not recorded altogether. One noted one was a run on Mario Party 7's Grand Canal sometime before the playthrough for the Summer Salt season, one where (yet again) Mr. Doom had an insanely good amount of luck. Clips from that episode were used as The Stinger for the 'canon' playthrough.
** Mr. Doom ended up finding a lost episode (a playthrough of 6's Castaway Bay) when he was going through his hard drive and posted it on his personal account.
* One of the threads that the work known as Website/{{Update}} consists of was deleted from the forum it's hosted on, but still exists in a PDF archive being [[KeepCirculatingTheTapes circulated]] and downloadable.
* Creator/AchievementHunter's Let's Play of the ''TabletopGame/MagicTheGathering'' Xbox Live arcade game was apparently filmed, but not uploaded. Any reference they make to it implies that it was incredibly boring.
** There's also an episode of ''[[LetsPlay/AchievementHunterMinecraftSeries Let's Build]]'' that has been removed due to InternetBacklash from finding out of a game Geoff and Gavin played that many people realized tantamount to ''stalking''. Both realized that, indeed, it did and apologized profusely over it.
* Prominent SCPFoundation writer Fishmonger had a falling out with the site and demanded his works be deleted under threat of legal action. His SCPs and other works are lost.
** They're not really lost, since an archive of (most) of his works can be found [[https://ia601005.us.archive.org/16/items/SCPFoundationTheFishmonger/ here]]. However, they can't be found on the SCP-wiki anymore. The others that are not included with the zip really are lost though.
* Many WebAnimation/YouTubePoop creators have been hit with this over the years, usually due to the poop getting taken down because of a copyright claim.
* ''WebVideo/TheNostalgiaCritic'' was going to have a tribute video dedicated to Rachel, who left the show as of the ''Film/FaceOff'' review. As mentioned in the actual episode, this video was accidentally deleted.
* The "Hotbox" episode of ''WebVideo/JakeAndAmir'' was never officially uploaded to YouTube [[ExactlyWhatItSaysOnTheTin for obvious reasons]].
* ''Website/{{ClickHole}}'' originally had a video called, "If You Grew Up With 'ComicStrip/CalvinAndHobbes,' You Need To Watch This Right Now". [[SchmuckBait It was a]] RuleThirtyFour [[SchmuckBait video]]. The video was soon removed, and trying to view it through the site's URL redirects you to the Website/YouTube page of the removed video.
* Creator/{{slowbeef}} and Creator/{{Diabetus}} had a test run of a ''WebVideo/{{Retsupurae}}'' livestream, but never bothered to save the video of it. Thankfully, one person watching actually ''did'' save the recording and it was later put up.
* The superhero web serial Literature/{{Star Harbor Nights}} could no longer be found online, though it is on [[http://web.archive.org/web/20140823104720/http://www.starharbornights.com/ The Wayback Machine]].
* Episode 376 of ''[[WebVideo/RhettAndLink Good Mythical Morning]]'', which featured Sam Pepper, has been removed as of September 2014. No reason was given, but since Pepper got himself in trouble for sexual harassment around that time...
* The episode of WebVideo/TheSlowMoGuys featuring Sam Pepper is no longer available on the main channel, though reuploads exist and the video was removed ''before'' Sam made a general ass of himself.
* ''[[WebVideo/RebelTaxi The Pizza Party Podcast]]''[='s=] 13th episode is all questions and answers, as Pan forgot to record his audio for the first part. The other podcasters lampshade the first half's status as a lost episode though.
* No recording is known to exist of the first several days of LetsPlay/TwitchPlaysPokemonRed, back before the stream became very popular. As a result, not much is known about the details of what happened then. The community generally refers to this period as the "Lost Days".

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