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Challengers of the Unknown #18
	DC Comics, 2-3/61

Bob Brown cover and art		1st appearance of Cosmo,
		the Challenger's space pet.

Books	CGC Label	CGC Total	Avg. Grade	Census Date	10	9.9	9.8	9.6	9.4	9.2	9.0	8.5	8.0	7.5	7.0	6.5	6.0	5.5	5.0	4.5	4.0	3.5	3.0	2.5	2.0	1.8	1.5	1.0	0.5
1. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	July 17, 2003													1
2. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	January 08, 2004													1
3. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	July 12, 2004													1
4. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	December 16, 2004													1
5. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	July 07, 2005													1
6. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	January 27, 2006													1
7. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	1	6.00	June 20, 2006													1
8. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	January 10, 2007													2
9. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	July 05, 2007													2
10. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	January 09, 2008													2
11. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	July 01, 2008													2
12. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	January 13, 2009													2
13. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	June 24, 2009													2
14. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	December 15, 2009													2
15. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	2	6.00	June 14, 2010													2
16. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	3	6.83	December 27, 2010								1					2
17. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	4	7.38	June 27, 2011							1	1					2
18. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	4	7.38	January 02, 2012							1	1					2
19. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	5	7.82	July 02, 2012				1			1	1					2
Books	CGC Label	CGC Total	Avg. Grade	Census Date	10	9.9	9.8	9.6	9.4	9.2	9.0	8.5	8.0	7.5	7.0	6.5	6.0	5.5	5.0	4.5	4.0	3.5	3.0	2.5	2.0	1.8	1.5	1.0	0.5
20. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	6	7.77	December 31, 2012				1			1	1		1			2
21. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	7	7.73	June 22, 2013				1			1	1		2			2
22. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	7	7.73	December 31, 2013				1			1	1		2			2
23. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	7	7.73	July 01, 2014				1			1	1		2			2
24. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	8	7.91	December 30, 2014				1		1	1	1		2			2
25. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	8	7.91	June 30, 2015				1		1	1	1		2			2
26. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	December 29, 2015				1		1	1	1		2			2		1
27. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	June 28, 2016				1		1	1	1		2			2		1
28. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	December 27, 2016				1		1	1	1		2			2		1
29. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	June 27, 2017				1		1	1	1		2			2		1
30. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	January 02, 2018				1		1	1	1		2			2		1
31. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	July 03, 2018				1		1	1	1		2			2		1
32. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	9	7.59	January 01, 2019				1		1	1	1		2			2		1
33. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	10	7.53	July 02, 2019				1		1	1	1		2	1		2		1
34. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	11	7.07	December 31, 2019				1		1	1	1		2	1		2		1					1
35. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	11	7.07	June 30, 2020				1		1	1	1		2	1		2		1					1
36. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	11	7.07	December 29, 2020				1		1	1	1		2	1		2		1					1
37. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	12	7.19	June 29, 2021				1		1	1	2		2	1		2		1					1
38. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	12	7.19	December 28, 2021				1		1	1	2		2	1		2		1					1
39. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	12	7.19	June 28, 2022				1		1	1	2		2	1		2		1					1
Books	CGC Label	CGC Total	Avg. Grade	Census Date	10	9.9	9.8	9.6	9.4	9.2	9.0	8.5	8.0	7.5	7.0	6.5	6.0	5.5	5.0	4.5	4.0	3.5	3.0	2.5	2.0	1.8	1.5	1.0	0.5
40. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	14	7.24	December 27, 2022				1		1	1	3		2	1	1	2		1					1
41. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	14	7.24	June 27, 2023				1		1	1	3		2	1	1	2		1					1
42. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	15	7.15	December 31, 2023				1		1	1	3		2	1	1	3		1					1
43. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	June 17, 2025				1		2	2	3		2	1	1	3		1					2
44. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	June 24, 2025				1		2	2	3		2	1	1	3		1					2
45. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	July 01, 2025				1		2	2	3		2	1	1	3		1					2
46. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	July 15, 2025				1		2	2	3		2	1	1	3		1					2
47. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	July 22, 2025				1		2	2	3		2	1	1	3		1					2
48. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	July 29, 2025				1		2	2	3		2	1	1	3		1					2
49. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	August 05, 2025				1		2	2	3		2	1	1	3		1					2
50. Challengers of the Unknown 18 (2-3/61, DC Comics)	Universal	18	7.11	August 12, 2025				1		2	2	3		2	1	1	3		1					2
51. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 27, 2011										1
52. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	January 02, 2012										1
53. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 02, 2012										1
54. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 31, 2012										1
55. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 22, 2013										1
56. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 31, 2013										1
57. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 01, 2014										1
58. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 30, 2014										1
59. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 30, 2015										1
Books	CGC Label	CGC Total	Avg. Grade	Census Date	10	9.9	9.8	9.6	9.4	9.2	9.0	8.5	8.0	7.5	7.0	6.5	6.0	5.5	5.0	4.5	4.0	3.5	3.0	2.5	2.0	1.8	1.5	1.0	0.5
60. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 29, 2015										1
61. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 28, 2016										1
62. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 27, 2016										1
63. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 27, 2017										1
64. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	January 02, 2018										1
65. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 03, 2018										1
66. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	January 01, 2019										1
67. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 02, 2019										1
68. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 31, 2019										1
69. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 30, 2020										1
70. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 29, 2020										1
71. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 29, 2021										1
72. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 28, 2021										1
73. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 28, 2022										1
74. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 27, 2022										1
75. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 27, 2023										1
76. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	December 31, 2023										1
77. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 17, 2025										1
78. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	June 24, 2025										1
79. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 01, 2025										1
Books	CGC Label	CGC Total	Avg. Grade	Census Date	10	9.9	9.8	9.6	9.4	9.2	9.0	8.5	8.0	7.5	7.0	6.5	6.0	5.5	5.0	4.5	4.0	3.5	3.0	2.5	2.0	1.8	1.5	1.0	0.5
80. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 15, 2025										1
81. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 22, 2025										1
82. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	July 29, 2025										1
83. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	August 05, 2025										1
84. Challengers of the Unknown 18 (2-3/61, DC Comics)	Restored	1	7.50	August 12, 2025										1

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