Theme: Who let you in? - Unwanted groups.
20A. Uninvited guests : PARTY CRASHERS
27A. Gold rush bad guys : CLAIM JUMPERS
49A. Thieves in the tombs of the pharaohs, say : GRAVE ROBBERS
58A. Early arcade game with pixelated aliens, and, in a way, what 20-, 27- and 49-Across all are : SPACE INVADERS
Argyle here. Just a Q short of a pangram. Everything worked out nicely; no strain to get words to pffft. A little step up from Monday.
Across:
1. Rhubarb desserts : PIES
5. Blue cartoon critter : SMURF
10. Spoiled one : BRAT
14. Mount of Greek myth : OSSA. A real mountain.
15. Old Testament prophet : HOSEA
16. Move like slime : OOZE
17. St. Bernard's bark : [WOOF!]
18. German WWII threat : U-BOAT. The submarine one.
19. Cowboy boot attachment : SPUR
23. '70s-'80s Olympic skier Phil : MAHRE. Remember?
25. Suffix with glob : ULE
26. "Just as I predicted!" : "SEE!"
32. Irish dance : JIG
33. Right triangle ratio : SINE
34. Minor quarrels : TIFFS
38. Egg cell : OVUM
40. "May the __ be with you" : FORCE
43. Fizzy drink : COLA
44. Hemmed in : BESET
46. Pop's Lady __ : GAGA
48. Flashlight output : RAY
53. Immigrant's subj. : ESL. (English as a Second Language)
56. Miss Teen __ : USA
57. "John Brown's Body" poet : BENÉT. Stephen Vincent Benét
63. 1974 Peace Nobelist from Japan : SATŌ. Eisaku Satō was the 39th Prime Minister of Japan and shared the Nobel Peace Prize with Seán MacBride in 1974.
64. Hersey's bell town : ADANO
64. Hersey's bell town : ADANO
65. Athletic equipment giant that sponsors golfer Rory McIlroy : NIKE
68. This, in Tijuana : ESTO
69. Twangy : NASAL
70. Like summer tea : ICED
71. Marvel Comics mutants : X-MEN
72. Succumbed to the sandman : SLEPT
73. Jacob's twin : ESAU
Down:
1. "Wham!" : "POW!"
2. Prefix with metric : ISO
3. Gullet : ESOPHAGUS. Whoa! Not a common word for any day of the week(but common enough for TV ads).
4. Jungle journey : SAFARI
5. Boarded up : SHUT
6. "__-Dick" : MOBY
7. Biennial games org. : USOC. (United States Olympic Committee)
8. Rise on hind legs, as a horse : REAR UP
9. Femme __ : FATALE
10. "Fiddlesticks!" : "BOSH!"
11. What rookies are shown, with "the" : ROPES
12. Sky shade : AZURE
13. To the point : TERSE
21. Radiation measures : REMS. Straight from the NRC Library, meaning.
22. Rockefeller Center muralist José María : SERT
23. Low-paying employment, slangily : McJOB
24. Partner of kicking : ALIVE
28. Peter Pan rival : JIF. Peanut butter.(#1 brand Jif)
29. Numero __ : UNO
30. Road sign with a double-tailed arrow : MERGE
31. Attack command word : SIC
35. "CSI" science : FORENSICS
36. Distress signal : FLARE
37. Speak, biblical-style : SAY'ST. "Than ours, a friend to man, to whom thou say'st, "Beauty is truth, truth beauty, — that is all." - Ode on a Grecian Urn - John Keats
39. Ryan of "When Harry Met Sally..." : MEG
41. Bronco or Mustang : CAR
42. Self-regard : EGO
45. Factual : TRUE
47. French cleric : ABBÉ
50. Chinese and Thai, e.g. : ASIANS
51. Property destroyer : VANDAL
52. Elton John collaborator Taupin : BERNIE
53. County near London : ESSEX
54. Twitch : SPASM
55. Drink with steamed milk : LATTE
59. Maine __ cat : COON. Aww!
60. Flower holder : VASE
61. Take __: doze : A NAP
62. Simpleton : DOLT
66. Hawaii's Mauna __ : KEA
67. College URL ending : .EDU
Argyle