Doctor Who Challenge

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Across
  1. 3. "So, you're my replacements! A..."
  2. 5. The secret behind Mona Lisa's smile
  3. 6. Definitely do not exist
  4. 10. 'Friend' of the First Doctor; extracted his tooth and gave him a gun
  5. 12. An episode where the Thirteenth Doctor visits 14th-century Aleppo to fight a shapeshifting cactus
  6. 15. Bow-ties, for example
  7. 18. Eighth Doctor's first line
  8. 19. The Doctor's Daughter
  9. 21. An old hero of the Doctor's, notable for their snake tattoo
  10. 22. The Sisterhood of ____
  11. 23. Douglas Addams' missing masterpiece
  12. 24. Number of Keys of Marinus
  13. 27. Demanded by the Third Doctor immediately after regeneration
  14. 29. Source of contention between the Sixth Doctor and Melanie Bush
  15. 30. A common kitchen staple, useful for killing Slitheen
  16. 31. Universe frog
  17. 32. The Fourth Doctor's only companionless story
  18. 33. JNT's peculiar fashion motif
  19. 36. "Doctor, Time Lord, yeah!"
  20. 37. McCoy novel, Tennant episode
  21. 38. Susan, titularly
  22. 40. Pre-UNIT group, led by Gilmore
Down
  1. 1. Word that convinced the Eleventh Doctor to leave retirement
  2. 2. The Second Doctor's doppelganger
  3. 4. Nyssa's homeworld
  4. 7. Doctorless and companionless episode
  5. 8. Ant-like cattle of the Menoptra
  6. 9. The Fifth Doctor's bowling claim in Black Orchid
  7. 11. Test the Gonds' intellect
  8. 12. Intended destination in the second Key to Time story
  9. 13. Rod, harp, great key, and black scrolls, for example
  10. 14. The Ninth Doctor tells this author he's a big fan
  11. 16. Clara uses a mnemonic to remember this password
  12. 17. The Seventh Doctor performed with them, the Twelfth Doctor fought with one
  13. 20. Real name of the Empty Child
  14. 25. Material of the chip in the TV Movie
  15. 26. Steven's companion in the Mechanoid city
  16. 28. Barbara's Aztec alter ego
  17. 31. Twelve's controversial alternate sonic
  18. 34. Native to Eden, source of Vraxoin
  19. 35. Metal featured in The Visitation and The Awakening
  20. 39. Come in red and blue, no more yellow