Issue Details

Issue	#12
Published	January-February 1958
Cover Price	0.10 USD
Pages	36
Editing	Jack Schiff
Notes	Fourth appearance of the Challengers of the Unknown.

Cover Details

Characters	Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]
Genre	Adventure
Pencils	Jack Kirby
Inks	Marvin Stein
Notes	Fourth appearance of the Challengers of the Unknown.
Reprinted	in Essential Showcase 1956-1959, The (DC, 1992 series) #nn; in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

6 page Challengers of the Unknown story "Menace of the Ancient Vials"

Characters	Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]; Amos Hunter; VILLAINS: Brommer; Gortz; Karnak
Genre	Adventure
Script	Dave Wood
Pencils	Jack Kirby
Inks	George Klein
Letters	Artie Simek
Notes	Chapter 1. Lettering credit from Rodrigo Baeza via the GCD-chat mailing list, March 2007.
Reprinted	in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

6 page Challengers of the Unknown story "The Fire Being"

Genre	Adventure
Script	Dave Wood
Pencils	Jack Kirby
Inks	George Klein
Letters	Artie Simek
Notes	Chapter 2.
Reprinted	in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

6 page Challengers of the Unknown story "Demon from the Depths"

Genre	Adventure
Script	Dave Wood
Pencils	Jack Kirby
Inks	George Klein
Letters	Artie Simek
Notes	Chapter 3.
Reprinted	in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

6 page Challengers of the Unknown story "The Deadly Duplicators"

Genre	Adventure
Script	Dave Wood
Pencils	Jack Kirby
Inks	George Klein
Letters	Artie Simek
Notes	Chapter 4. Series continued in Challengers of the Unknown 1.
Reprinted	in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

2 page Professor Eureka filler "A-Bomb][First Line: Professor, your research and development ..."

Genre	gag
Script	Henry Boltinoff
Pencils	Henry Boltinoff
Inks	Henry Boltinoff
Letters	Henry Boltinoff
Notes	Title and first line from Arthur Lortie, added August 2006.