Was the very first of its kind: a "mega-crossover" comic wherein multiple heroes and villains came together, not just to compete, but to survive an all-out super-powered slobberknocker among the stars. In MARVEL SUPER HEROES SECRET WARS (1984) #1. Many of the Marvel Universe's most prominent heroes-including the Avengers. Suddenly found themselves transported onto a strange spaceship floating in the middle of uncharted oblivion.
This was a landmark moment for Marvel's heroes, as they had never before came together in such a way. And while there was safety in numbers, there was also confusion, as no one seemed to understand how they got there, or-more importantly. The heroes watched on as an entire galaxy was snuffed out in the blink of an eye and replaced by a patchwork planet. Which served as a theater of war between the two groups, was created by the impossibly powerful being known as the Beyonder.
Who encouraged the heroes and villains to slay each other by promising the winning side their hearts' desires.