10 Marvel Supervillains Who Almost Destroyed The Avengers

10. Loki

It is no coincidence that Marvel Studio's first-ever live-action Avengers film featured Loki as the primary antagonist, so too did the first-ever Avengers comic book, Avengers #1 in 1963.

In their comic book debut, the Avengers are actually only assembled by Loki himself, as he attempts to defeat them. Manipulating Bruce Banner and subsequently the Hulk's mind, Loki attempts to use the big green rage machine as a weapon with which he can defeat his brother, Thor.

Loki's plan seemed solid enough and probably would have worked, were it not for Rick Jones, the Hulk's long-time comic book sidekick. Jones sends a distress signal out asking for the help of other superheroes, telling them that the Hulk is innocent and is simply being manipulated. This radio broadcast is received by all kinds of characters including Iron Man, Ant-Man, the Wasp, and even the Fantastic Four.

Ultimately, Loki's actions wind up accidentally bringing about the formation of The Avengers as the original team of Hulk, Iron Man, the Wasp, Ant-Man, and Thor all unite to defeat Loki.