Avengers: The Crossing

In 1995, Marvel shook up its core line with Avengers: The Crossing, a controversial crossover event that saw Earth's Mightiest Heroes betrayed from within. Written primarily by Bob Harras and Terry Kavanagh, with striking art by Mike Deodato Jr., the series introduced a shocking new villain and permanently altered the team's status quo. Though only a single issue, its repercussions rippled through the Avengers titles, making it a pivotal—if divisive—moment in 1990s Marvel storytelling.