It's hero against hero in the Avengers/Defenders War. Cap vs. Namor! Thor vs. Hulk! It's the original crossover clash and there's never been another one like it. But before our heroes take sides against each other, there's even more trend-setting classics in store for you: Mantis makes her first appearance; the Lion God brings the Avengers to their knees; Vision and the Scarlet Witch's relationship blossoms, but not without the intolerant objections of others.