ACROSS 1. Marine from Mayberry
5. Lessens
9. Financial backer
14. Existent
15. Cheap magazine material
16. Like some boas
17. Machine that can think, to some degree
20. Chuck Todd's network
21. Without delay
22. Anticounterfeiting agents
23. White Russian component
25. Actor Reeves of "Speed"
27. Alternative to a local
32. "Time ___" (1990s sci-fi TV series)
35. Woody Allen's "Hannah and ___ Sisters"
36. Squalid
37. Stimpy's cartoon bud
38. African serpent
39. Uncle of Barbara and Jenna
41. Make haste, quantly
42. Tatum of "Paper Moon"
44. Clink
45. Fails to exist
46. Hopelessly kaput
50. Former Red Sox star Garciaparra
51. Beale Street blues legend
55. Sauce brand
58. Divine revelation
60. Nairn negative
61. Contrary to convention or norms
64. Extreme factions
65. Consider, judicially
66. Facts, say
67. Cla** that's a snap
68. Disclaimer of a sort
69. Western Colorado feature DOWN 1. Mischievous caper
2. San Francisco Bay's ___ Buena Island
3. Gate feature
4. Inventor Whitney
5. Famous last words?
6. Osso ___
7. Indicator on a vehicle
8. Parking garage allotments
9. Fliers' mil. post
10. Feed and protect
11. Tiny weight unit
12. Iroquoian tribe
13. Loretta of country music
18. ___ pas (social blunder)
19. Grazing grounds
24. Superman's foe Luthor
26. Accident investigation gp.
28. Business agent, for short
29. Contented sighs
30. Poker player's phrase
31. Turndown from Putin
32. Walked on
33. Tahoe gateway
34. With a clean slate
38. Saxophone variety
39. Word after Leyden or Mason
40. People whose "help" may actually be hurtful
43. Investment vehicle
44. Some bank ad statistics (abbr.)
45. Printer cartridge filler
47. Managed care a**ns.
48. Kitt who sang "Santa Baby"
49. "___ your pardon!"
52. Mindless
53. Innocent sorts
54. Birthplace of Columbus
55. Hambletonian, e.g.
56. Restaurante request
57. They go with guys
59. Indian spiced tea
62. Super-secret government group (abbr.)
63. Part of a crater