Another one. Again, probably not exactly the right example... but this time it is a book, and this time I personally know what utter horror resulted from all this. Plus, it is about a book that many of you know...
Well, now that I think about it, these days most of you just watched the fucking movie... so go and read the fucking book, you ignorant bastards!
Still, for those who know: Tolkien's works about Middle-Earth consist of Hobbit, Lord of the Rings trilogy and Silmarillion. And, while first two he published himself, we can already say that his work continued after his death 'cause Silmarillion was published posthumously by his son. So yeah, the world as we knew it was expanded upon in this prequel of sorts.
However, it didn't end there. We all know that LotR is a fantasy epic that created huge fandoms. And fandoms lead to - and I feel dirty saying the word - fan-fiction. And here we are taking the gloves off, 'cause fan-fiction can be everything from cross-overs to fucking slash fiction. Google that term. Hell, even I did a big LotR fan-fiction project back in the day, which was well-received by Russian LotR fandom.
But what if you want to deliberately rape the world created by Tolkien with your fan-fiction, while catering to the dumbest readers out there AND you want to make money out of it? Because that's exactly what happened.
Popular Russian fantasy-writer Nick Perumov did exactly that. He made himself famous by writing 'Ring of Darkness' trilogy (actually, first there were only two books, then he made third one which was crazier than first two together) in the Middle-Earth setting after Lord of the Rings events. Btw, the fuck denied that that thing is his 'sequel to LotR'. Let me give you a plot of those.
After war described in LotR came new age, age of humans, with evil forces beaten and hiding, elves slowly buggering away to Valinor and Hobbits still being quiet farmers. One Hobbit, however, does not want to life quiet farming life and he spends all his time re-reading old book about events of the war. One day he is visited by a dwarf who searches for the book to help him in uncovering mysteries of Moria. The two start traveling together. Along the way they find out that darkness gatheres again - around a human who is founding old Nazgul rings one by one.
So... not a continuation in any way, yep. And hey, it could be a nice read, but the scale of idiocy is off the charts here. Let me just mention few things here. First of all - hobbit himself. This one end up being proficient in melee and range fighting, including bows, daggers and throwing daggers. He gets mythril armor making him unkillable, he finds ancient artifacts, giving him more combat bonuses and gets a position of centurion in a human army. This is a 80 lvl hobbit. No, really, that the meme that appear after the whole thing. The kind of hobbit that walks up to the dragon, hits him on the head with a stick, puts all the treasures in a single bag and moves on to find something more challenging. Next. Along the way there are new races and tales of new lands - just brought onto the Middle-Earth. Weird legends and sayings. And if that wasn't enough, there are creatures found in the books that are more powerful than even Vala. Those same creatures made his way into other books of the author later and became something like his trademark most people do not like him for. Oh, and to top it all off, you know how the books end? Well, they end with our good heroes attacking Valinor. Seriously. And going right through it and bursting through it into another newly created world. Happy end.
The books are horrible. Well, first two are readable, but the last one is utter shit. And noone would have red them if the whole thing wouldn't be presented and 'actual continuation of LotR'. Well, as you can imagine, a whole lot of Tolkien fans hates Perumov for it still. And rightly so.
So, that's my another example. Making horrible read on a foundation of cult classics and making a name for yourself with it.