I was thinking about this today. Can anyone name some? Easy examples of course would be the Clone Saga and OMD for Spider-Man. But I want to go back a little bit further though. Like the "Dream's End" arc in X-Men. It pretty much signified the end of 90's X-Men comics as they segued into the next decade with the Grant Morrison era and with Eve of Destruction being the final stamp on the decade. In Dream's End longtime supporting characters like Senator Kelly and Moira MacTaggert were killed off and things never felt the same after that. Does anyone have more they can think of? Avengers, FF, Thor, Iron Man or any DC stuff as well like Superman, Batman, Wonder Woman, Green Lantern....? I'm hoping this thread will spark up some reminiscing about old era's for some of these comics so it could benefit any newer fans interested in older stories.