Nuke Them All

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Across
  1. 2. Humblest Android Version
  2. 4. The Singer to win a Nobel
  3. 7. The TBBT comic-book shop owner
  4. 9. Kryptonian General
  5. 11. Leonardo Di Caprio in Inception
  6. 12. 1983 GUI computer by Apple
  7. 14. The cop in GTA San Andreas
  8. 15. Faces that don't exist
  9. 17. An espresso drink that also consists of espresso steamed milk and foam
  10. 18. Performs the traffic directing functions on the Internet
  11. 19. H of PHP
  12. 20. The Prime Sieve
  13. 23. Kitretsu's Robot
  14. 24. Secretary-General of United Nations from 2017
  15. 25. MCU divided by two
  16. 26. First Man in Space
  17. 27. Drummer of The Beatles
  18. 28. Simon Riley COD
Down
  1. 1. The dog in Famous Five
  2. 3. To be or not to be
  3. 5. Mary Shelley
  4. 6. Woz
  5. 8. Rotation Power Containment Naruto
  6. 10. QT movie title: also a Framework
  7. 12. "What is life? It depends on the-" Andhadhun
  8. 13. An Open Source in Blockchain by The Linux Foundation
  9. 16. Deadpool LUCKily sells Pizza
  10. 21. C:KND What is C
  11. 22. Joey's stuffed penguin
  12. 25. The Father of Bats