Marvel! (No explanation needed)

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Across
  1. 3. This Superhero has a brother and is a Norse god.
  2. 5. This superhero is one of the most powerful superheroes, and he doesn't even have superpowers.
  3. 6. This superhero is often dressed in red and black.
  4. 8. One of the only male superheroes that has a sidekick.
  5. 9. This superhero got his powers from gamma radiation.
Down
  1. 1. This superhero used to be a skilled surgeon.
  2. 2. This superhero was trained by a Secret Red Room organization.
  3. 4. The female superhero cousin of Bruce Banner.
  4. 7. This person has sometimes acted as a hero and sometimes a villain. He is also a god.