Excelsior!

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Across
  1. 6. A hero both great and small
  2. 8. He gets upset sometimes and loves tacos
  3. 10. He can do this all day
  4. 11. He's Sorcerer Supreme, though by a technicality
  5. 13. Daughter of Thanos, and the sparkle in Quill's eye
  6. 15. He shouldn't have trusted that cat
  7. 16. Tony Stark's AI butler, who grew into The Vision
  8. 18. Never has the same haircut twice
Down
  1. 1. Ozzy was this, but Tony is now
  2. 2. Only 3 people so far have been worthy enough for this
  3. 3. Spider-Man assumed this was a made-up name
  4. 4. Spent 30 seconds on the internet and decided that mankind had to go
  5. 5. A government agency trying to protect the earth
  6. 7. He is inevitable
  7. 9. Has been an agent and a ronin, but is known as a dad
  8. 12. Has a limited vocabulary
  9. 14. Home to some godly brothers
  10. 17. She sure loves those sitcoms. Also robots.