Continuity will always be a problem for comics; serial fiction will always struggle to progress under the weight of its history. And with characters as old as Spider-Man or the X-Men, Marvel Comics is no exception to the rule. So what do writers do when it feels like their character is collapsing under the weight of 50 years worth of back-stories? They bust out a retcon. Often used to rewrite or explain away a key plot point in a characters history, retcons (short for retroactive continuity) can be an extremely tool for a writer whose working on a character that has been around since the dawn of time. However, because the Marvel Universe is already a wacky place where the boundaries of life and death, fiction and reality are blurred, some of Marvels most famous retcons have left many a fan shall we say upset? Maybe irate might be a better adjective. Nevertheless, some of Marvels most infamous retcons have paved the way for some of the best and most exciting stories in their cannon. Out of Marvels 76 years of publications, heres a list of Marvel retcons some better than others that people are still talking about and arguing over to this day. This article does contain spoilers, so proceeded with caution.