Price history & market evidence
PriceCharting guide history
Dated guide estimates for this edition, separate from completed sales.
1 dated observation—one point does not establish a trend. Last recorded 2026-10-06. Source record #2424581
Price observations belong to this edition. Guide estimates, catalog references and completed sales are separate kinds of evidence.
| Grade | Amount | Evidence | Recorded |
|---|---|---|---|
| 10.0 | $12,305.00 | PANEL_PROFITS · grade_10_0_valueguide | 1959-02-01 |
| 4.0 | $102.94 | PANEL_PROFITS · grade_4_0_valueguide | 1959-02-01 |
| 6.0 | $241.95 | PANEL_PROFITS · grade_6_0_valueguide | 1959-02-01 |
| 8.0 | $1,311.81 | PANEL_PROFITS · grade_8_0_valueguide | 1959-02-01 |
| 9.2 | $9,465.38 | PANEL_PROFITS · grade_9_2_valueguide | 1959-02-01 |
| 9.6 | $10,412.00 | PANEL_PROFITS · grade_9_6_valueguide | 1959-02-01 |
| 9.8 | $290.00 | PANEL_PROFITS · grade_9_8_valueguide | 1959-02-01 |
| RAW | $49.99 | PANEL_PROFITS · ungraded_valueguide | 1959-02-01 |
Reading this edition’s market
Compare the same cover, printing and grade before setting a bid. A raw guide or a higher-grade price does not establish a slab’s value. Include selling fees, shipping and the depth of completed-sale evidence when assessing an exit price.
The table includes 8 guide observations and 0 catalog references. These are reference values, not guaranteed sale proceeds.
Graded population
CGC records 59 graded copies for Challengers of the Unknown #6 (1959). Population is the number recorded by this grading source, not the total print run or all surviving copies.
Captives of the Space Circus
Answering an SOS from a boat that has struck an ice berg, the Challengers) soon learn that it was a trick by aliens from outer space and are taken prisoner. They are then forces to be exhibits in the Space Circus. Forces to fight gigantic beasts from other planets, the Challengers eventually break free from their cage and free the other captive species and lead a revolt which leads to the eventual capture of the ring master. Taking the ship back to it's home planet, the Challengers turn the ringmaster over to the authorities there before being returned home.
| StoryTitle2 = The Sorceress of the Forbidden Valley | Synopsis2 = While exploring a cave, June Robbins rubs a mystic lamp she finds there and is soon found missing. The Challengers), going to find her discover an ancient city. They are attacked by the locals, as well as June who has gained magical powers. They are soon imprisoned and learn that June is being manipulated by the criminal Charles Agar, who explains that the gas from the lamp had granted June magical powers. The Challengers soon escape from their cells, free June from Agars control, and expose him to the people of the forbidden valley for what he truly is. With her magic powers worn off, June returns home with the Challengers, dumping the magic lamp into the ocean so it won't menace anyone ever again.
| Appearing1 = **Featured Characters:** * Challengers of the Unknown) ** Walter "Prof" Haley) ** Lester "Rocky" Davis) ** Matthew "Red" Ryan) ** Kyle "Ace" Morgan) **Supporting Characters:** * **Antagonists:** * **Other Characters:** * **Locations:** * **Items:** * **Vehicles:** *
| Appearing2 = **Featured Characters:** * Challengers of the Unknown) ** Walter "Prof" Haley) ** Lester "Rocky" Davis) ** Matthew "Red" Ryan) ** Kyle "Ace" Morgan) **Supporting Characters:** * June Robbins) **Antagonists:** * **Other Characters:** * **Locations:** * **Items:** * **Vehicles:** *
| Notes = * This issue is reprinted in Challengers of the Unknown Archives Vol. 2 (Collected). | Trivia = | Recommended = | Links =
Creative credits
Writers: Jack Kirby, Dave Wood, Jack Kirby, Dave Wood
Interior art: Jack Kirby, Jack Kirby
Source records & attribution
Panel Profits keeps each source identity attached to its edition record.
COMICBASE: comicbase:224102
GCD: 14861
PANEL PROFITS: 2424581