History MissingEpisode / WebComics

* A lot of the original ''Webcomic/{{Magiversity}}'' strips were lost when Website/TheDuck crashed in 2005, as the creator didn't have backups.

* All webcomics formerly hosted on Website/{{Smackjeeves}} which were not mirrored elsewhere before the site's closure on December 31, 2020 are now lost.

* The Internet era has created a new type of Missing Episode. Increasingly, promotional web-only tie-in stories or games are used on official sites to promote a product, event, or work. Once the promotion has run its course, the official sites may disappear, along with all that tie-in material. And the relative complexity of a web-hosted multimedia work makes it difficult to just KeepCirculatingTheTapes. To take just one illustrative example, comics writer Gail Simone wrote a ''Franchise/{{Superman}}'' interactive webcomic story for an official Pepsi ''Film/SupermanReturns'' promotion. Since the Pepsi promotion ended long ago, and its site is now defunct, if you didn't read it at the time, odds are you never will.
* As mostly amateur projects, webomics are heavily prone to this. Many cease updating when the creator loses interest or has no time to continue drawing. When the host shuts down or the creator doesn't renew their account, the website disappears and takes all the comics with it unless die-hard fans took the opportunity to archive everything. This is so common, in fact, that even ''we'' at Tv Tropes are desperately trying to develop an habit of dowloading and/or creating saved copies of webcomics and other online media before it is too late. Feel free to contribute to this endeavor.

* [[https://web.archive.org/web/20121014145605/http://spikedmath.com/390.html 390 - The Pigeonhole Principle]]: Lists a few applications of the the pigeonhole principle. The last one is proving infidelity.

* [[https://web.archive.org/web/20140915194054/http://spikedmath.com/561.html 561 - Video comics #1 and #2]]: Two video comics. Oddly, the videos are still available on [[https://www.youtube.com/channel/UCxCgZpnvT8w1PWrYAo5R6bA the comic's YouTube channel]]

Many ''Webcomic/SpikedMath'' comics have been removed. In particular, it seems like comics involving sex and/or stereotypes are more likely to be taken down. The missing comics are skipped in the archive and by the prev/next buttons, but the random button can still try to send you to one, which will give you a 404 page. Here's a mostly complete list of missing comics:

* The original form of [[http://coachrandom.zzl.org/Chronological/comic-043.xml Strip #43]] has only been mentioned in the author's (Scott Ruhl) comments. Even the ''webmaster'' of the site has never seen it - although considering the pun involved with the final strip, one can imagine why Scott Ruhl withheld it from publication.

* [[https://web.archive.org/web/20120624220928/http://spikedmath.com/036.html 036 - Difference Between Numbers And People]]: It's a period joke. The original version was incorrect, but gets a "fixed" version that points out the mistake.