Theme: No Reveal Monday - Not to worry ~ it's all here.
20. Theoretical temperature at which molecular activity ceases : ABSOLUTE ZERO
31. Astronomical phenomenon : TOTAL ECLIPSE
40. 0, 1, 2, 3, etc. : WHOLE NUMBERS
52. Rarity for a pitcher, nowadays : COMPLETE GAME
Argyle here. A bit of a reversal today; I used the theme entries to help get the fill.
Across:
1. Trek to Mecca : HAJJ. Had to wait on the last letter.
5. Astringent in taste : ACERB
10. Something made on a shooting star : WISH
14. Brainstorm : IDEA
15. Circus animal handler : TAMER
16. Pot starter : ANTE
17. 1999 satire about a reality show : EDtv. A film directed by Ron Howard.
18. Erie or Cree : TRIBE. Another reversal; Erie as a clue.
19. KOA visitor : RVer. Kampgrounds of America, where the recreational vehicle owners stay.
23. __-and-effect : CAUSE
26. Wimbledon do-over : LET
27. Quieted, with "down" : TONED
28. Wes in the Basketball Hall of Fame : UNSELD. Bio.
30. __ Domingo : SANTO
35. Bambi's aunt : ENA
36. "Mr." with Jim Backus' voice : MAGOO. "Oh Magoo, you've done it again!"
37. In line for : DUE
44. Pasty-faced : ASHEN
46. Ability spotted by a scout : TALENT
47. Slow-moving mollusk : SNAIL
48. "__ was saying ... " : AS I
51. Actress Rene : RUSSO
55. Some dadaist pieces : ARPS. The World According to Arps. Oops, wrong Arps. It should be Jean Arp or Hans Arp but Ron Arps is something different so I think I'll leave him.
56. Go to pieces : PANIC
57. Rocker Hendrix : JIMI
61. "The Lion King" lion : NALA. Wiki.
62. Show beyond doubt : PROVE
63. Eve's partner : ADAM
64. Represent unfairly : SKEW
65. Fathered : SIRED
66. Toy on a string : YOYO
Down:
1. Shake a leg, quaintly : HIE
2. Put two and two together : ADD
3. Air Force One, for one : JET
4. Indonesian site of a WWII naval battle : JAVA SEA
5. Some "Night Court" characters: Abbr. : ATTs. (attorneys)
6. "Silent Night," e.g. : CAROL
7. Novelist Zola : ÉMILE. If you ask me what I came into this life to do, I will tell you: I came to live out loud.
8. Counter, as an argument : REBUT
9. Author Harte : BRET. Born: August 25, 1836, Albany, NY, but wrote about the Gold Rush.
10. Dangerous place for an embedded journalist : WAR ZONE. (and everyone else)
11. Dream up : INVENT
12. Man cave system : STEREO
13. "The Great" Judean king : HEROD
21. Ding-dong maker : BELL. Hah! It's really Hostess.
22. Sched. postings : ETAs
23. Like kitten videos : CUTE
24. Any minute, to Shakespeare : ANON
25. Court sports org. : USTA. (United States Tennis Association)
29. Sinister spirit : DEMON and 41D. 29-Down's milieu : HELL
30. Teapot feature : SPOUT
32. Western neighbor of Nev. : CAL.. (Nevada/California)
33. Size up from med. : LGE.
34. Charged particle : ION
37. Dead ends? : DEEs. First and last letters.
38. Coffee servers : URNS
39. __ perpetua: Idaho's motto : ESTO. "Let it be perpetual". Idaho forever!
40. Two-person log-cutting tool : WHIP SAW. Crosscut top and ripsaw bottom (used for making planks)
42. Schoolteacher of old : MARM
43. Toronto baseballer : BLUE JAY. shout out
44. Hooded ski jacket : ANORAK. 1920-25; & Inuit (Greenlandic) annoraaq (I doubt they did much skiing.)
45. Supermarket freebie : SAMPLE
47. Speed-reads : SCANS
48. Big name in arcades : ATARI
49. Madrid mister : SEÑOR
50. "Uncle!" : "I GIVE!"
53. Actor Omar : EPPS. Now starring on the ABC drama Resurrection.
54. Got a hole-in-one on : ACED
58. Wedding vow : "I DO"
59. Memorial Day month : MAY
60. "I think," in texts : IMO. (in my opinion)
Argyle