Merry Xmas and Hammy New Year!

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