Data courtesy of the Grand Comics Database under Creative Commons license.

Issue Details

Issue #1
Published April-May 1958
Frequency bi-monthly
Cover Price 0.10 USD
Pages 36
Editing Whitney Ellsworth (credited); Jack Schiff (actual)
Notes Like many DC first issues, there is no number on the cover.

Cover Details - "The Human Pets!"

Characters Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]
Genre Adventure
Pencils Jack Kirby
Inks Jack Kirby
Letters Ira Schnapp
Notes Credits updated 10/06 by Bob Hughes. Previously inker listed as Marvin Stein. Per Stein's conversations with Greg Theakston, he did not ink any Challengers stories.
Reprinted in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

14 page Challengers of the Unknown story "The Man Who Tampered With Infinity"

Characters Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]; June Robbins (called June Walker); Olan Tagorian
Genre Adventure
Script Jack Kirby
Pencils Jack Kirby
Inks Jack Kirby?; Roz Kirby (blacks)
Notes Credits updated 10/06 by Bob Hughes. Previously inker listed as Marvin Stein. Per Stein's conversations with Greg Theakston, he did not ink any Challengers stories.
Reprinted in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1

10 page Challengers of the Unknown story "The Human Pets"

Characters Challengers of the Unknown [Ace Morgan; Professor Haley; Red Ryan; Rocky Davis]
Genre Adventure
Script Jack Kirby
Pencils Jack Kirby
Inks Jack Kirby?; Roz Kirby (blacks)
Notes Credits updated 10/06 by Bob Hughes. Previously inker listed as Marvin Stein. Per Stein's conversations with Greg Theakston, he did not ink any Challengers stories.
Reprinted in Superman Presents World's Finest Comic Monthly (K. G. Murray, 1965 series) #105; in Challengers of the Unknown (DC, 1973 series) #79 (March-April 1973); in Challengers of the Unknown Archives (DC, 2003 series) #1 (July 2003); in Showcase Presents Challengers of the Unknown (DC, 2006 series) #1