Superheroes and Villains

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Across
  1. 3. Master of Magnetism
  2. 4. Cat burglar of Gotham City
  3. 6. also known as Logan
  4. 9. Man of Steel
  5. 12. Dark Knight
  6. 18. Can turn completely invisible
  7. 20. wielding the hammer Mjolnir
  8. 21. Batman's arch-nemesis
Down
  1. 1. Wielder of a power ring charged by a lantern
  2. 2. Fastest man alive
  3. 5. Alter ego of Diana Prince
  4. 7. Symbiote host Eddie Brock
  5. 8. who turns green when angry
  6. 10. Batman's sidekick
  7. 11. Pirate captain with a metal hand replacement
  8. 13. Blue-skinned Marvel villainess
  9. 14. Fire Nation princess
  10. 15. Arch-nemesis of the Teenage Mutant Ninja Turtles
  11. 16. With great power comes great responsibility
  12. 17. Leader of the Akatsuki in Naruto
  13. 19. Gorgon with snakes for hair