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

Issue Details

Issue	#28
Published	October-November 1962
Cover Price	0.12
Pages	36
Editing	Murray Boltinoff
Notes	first Challenger's Mail Chute (letter column).

Cover Details

Genre	adventure
Pencils	Bob Brown
Inks	Bob Brown
Notes	first Challenger's Mail Chute (letter column).

11 page Challengers of the Unknown story "The Revolt of the Terrible FX-I"

Genre	adventure
Script	Arnold Drake?
Pencils	Bob Brown
Inks	Bob Brown
Notes	writer id by Bob Hughes

14 page Challengers of the Unknown story "Riddle of the Faceless Man"

Genre	adventure
Script	Ed France Herron?
Pencils	Bob Brown
Inks	Bob Brown
Notes	writer id by Bob Hughes