Just What Do You Think You're Doing, Dave?

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Across
  1. 3. Dune author Frank
  2. 6. __ the Genocide
  3. 8. Sagan's seminal series
  4. 9. 1984 author George
  5. 11. Luke's x-wing squadron
  6. 13. They dream of electric sheep
  7. 17. Brown wizard of Tolkien lore
  8. 18. Trilogy by 21-across
  9. 20. King of Narnia
  10. 21. I, Robot author Isaac
  11. 22. Classic sci fi author Jules
  12. 24. Period of origin of Crichton's revived colossi
  13. 25. Hairy-footed creature that lives in a hill
Down
  1. 1. Setting of Bradbury's Chronicles
  2. 2. "Set your __ to stun"
  3. 4. Hitchhiker's Guide author Douglas
  4. 5. Fated role in the Wheel of Time series
  5. 7. Novel that was the inspiration for the Matrix
  6. 10. Nickname for a H. G. Wells alien craft
  7. 12. Arguably the first sci fi novel
  8. 14. Colossal beasts in the work of 3-across
  9. 15. Wizard prison
  10. 16. Clark's cylindrical alien ship
  11. 19. Term coined by Heinlein
  12. 23. Harry's house elf companion