Inks credit from Bob Hughes. We previously credited Marvin Stein.
Logo design credits from Todd Klein via his Facebook posting Comics Logos C #37: CHALLENGERS OF THE UNKNOWN on 2 August 2021.
Inside front cover.
Possible Stein inks per Nick Caputo. Previous indexer credited Wally Wood.
Possible Stein inks per Mark Evanier and Nick Caputo after studying his concurrent work. In conversations with Greg Theakston, Stein said he did not ink any Challengers stories but it's possible he had forgotten. Previous indexers credited Jack and Roz Kirby on inks.
Possible Stein inks per Mark Evanier and Nick Caputo after studying his concurrent work. In conversations with Greg Theakston, Stein said he did not ink any Challengers stories but it's possible he had forgotten. Previous indexers credited Jack and Roz Kirby on inks.
Child alien plaything motif was reused by Kirby in Fantastic Four (Marvel, 1961 series) #24, “The Infant Terrible” as per Comic Book Historians article researched by Alex Grand.