Conversation so far:
Who are The Avengers?
The Avengers are a fictional team of superheroes appearing in limited series comic books published by Marvel Comics. ... Labeled Earth's Mightiest Heroes, the Avengers originally consisted of Ant-Man, the Hulk, Iron Man, Thor, and the Wasp.
Tell me about The Avengers' first appearance.
First appearance The Avengers #1 (September, 1963)

Question: Who is the most powerful and why
Self-contained rewrite: Who is the most powerful of The Avengers and why?