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Challengers of the Unknown #64 cover
Cover: Joe Kubert

Challengers of the Unknown #64

Oct 1968 · DC · 0.12 USD
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In "Invitation to a Hanging!", the Challengers of the Unknown confront a chilling mystery when the criminals they helped convict—Wolf Dengon, Shark Powell, and Snake Saunders—are executed, only to return as vengeful ghosts. Written by Robert Kanigher and illustrated by Jack Sparling, with lettering by Milt Snapinn, this eerie 1968 tale unfolds with a haunting twist as the Challs uncover a macabre scheme tied to Doc Hemlock’s apparent death. The cover, by Joe Kubert, captures the grim tension of a hanging that’s far from final.

Contains 3 stories
Invitation to a Hanging!
11.17 pp · Adventure
Challengers of the Unknown [Ace MorganRocky DavisProf HaleyRed Ryan]Judge BentleyJohn EvansDoc HemlockWolf DengonShark PowellSnake Saunders

In "Invitation to a Hanging!", the Challengers of the Unknown confront the eerie aftermath of a trio of criminals' execution—Wolf Dengon, Shark Powell, and Snake Saunders—whose final threats of resurrection echo through the night. When the dead begin to rise in unnatural ways, the Challs find themselves hunted by ghostly apparitions and their own mechanical doubles, leading them to a shocking revelation in Doc Hemlock’s hidden lair.

The Secrets of the Sorcerer's Box!
6 pp · Adventure

In "The Secrets of the Sorcerer's Box!", four heroes survive a miraculous crash only to find themselves with a strange, borrowed time—unharmed, unbroken, and bound by a new purpose. Summoned by Morelian, a descendant of Merlin, they embark on their first true mission: to open the four chambers of a perilous alchemist’s box and witness wonders beyond mortal understanding.

Chapter Two: Dragon Seed!
6 pp · Adventure

In "Chapter Two: Dragon Seed!", the Challengers of the Unknown face their latest peril on a remote tropical island, where a mysterious box holds a secret that awakens a legendary stone giant. After the first chamber unleashes the creature—capable of destroying ships and shrugging off an atom bomb—the team must decide whether to risk opening the next chamber, with Rocky standing ready to break it open.

ComicBooks.com Value

Our Model is In Beta
Raw (VG) $6
CGC 9.6 · 2 in census $281
CGC 9.4 · 1 in census $144*
CGC 9.2 · 2 in census $83*
CGC 9.0 none in existence
CGC 8.5 none in existence
CGC 8.0 none in existence
Show all 13 grades
CGC 7.5 none in existence
CGC 7.0 · 1 in census $20*
CGC 6.5 · 1 in census $20*
CGC 6.0 none in existence
CGC 5.5 none in existence
CGC 5.0 · 1 in census $20*
CGC 4.5 · 1 in census $20*
* estimate — limited direct-sales data at this grade
Our model’s value — refined as new sales data arrives · CGC census counts shown where available

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Full credits

artist, inker Jack Sparling
letterer Milt Snapinn
cover pencils, inks Joe Kubert

Reprints

↩ Reprints Showcase #6 (1957)

Reprinted in Aventures Fiction #31 (1973)

Key issues in Challengers of the Unknown

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