Merry Xmas and Hammy New Year!

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Across
  1. 1. / You'll see me more than once in this puzzle
  2. 5. / Julia's imaginary friend
  3. 7. / A dandy
  4. 8. / Easily frightened miss
  5. 9. / You'll see me only once in this puzzle
  6. 11. / Galileo's
  7. 12. / Hairy chested
  8. 14. / A friend of …
  9. 17. / Famous explorer
  10. 18. / What a history teacher teaches
  11. 20. / A true Turkish delight
  12. 21. / Houston force of nature
  13. 22. / 2 PhDs
  14. 24. / Vermilion
  15. 25. / A metaphor for passion
  16. 27. / Amazing
  17. 28. / Pickle breath
Down
  1. 1. / Heinlein's, for short
  2. 2. / A good sport, no longer in play
  3. 3. / What we speak with
  4. 4. / Swampmate
  5. 6. / Bye, bye hammy!
  6. 8. / I'm a fan of this story, and who can blame me?
  7. 10. / Many a song has been written for her
  8. 13. / Doc, Dopey, Bashful, Grumpy, Sneezy, Sleepy, Happy, ____(,)____
  9. 15. / Yellow movie character
  10. 16. / Bedroom surprise
  11. 19. / You're a fan of this story, and who can blame you?
  12. 23. / Blue movie character
  13. 26. / Harlan Ellison's better half