Published: June-July 1959
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Story Featuring Challengers of the Unknown
June's friend Marie comes to meet the Challengers to ask them to investigate weird events in her home country of Mordania. There they meet and fight the evil Drabny, whose scientific inventions have enabled him to take over Mordania.
Introduction of Drabny, later a member of the Challenger Haters.
Introduction of Kra, later a member of the Challenger Haters.
Appears on the page immediately preceding page 8 of the previous story sequence.
"Am I glad we finally quit that rodeo, Slim!"
Appears on the page immediately following page 7 of the previous story sequence.
Story Featuring Professor Eureka
"I'm glad you dropped in, Prof. Eureka!"
House ad for House of Mystery (DC, 1951 series) #87 and My Greatest Adventure (DC, 1955 series) #32.
Ad Featuring Wilson Chemical Company Cloverine Brand Salve
Sold by Wilson Chemical Co. Back cover.
Ad Featuring Littleton Stamps
Inside back cover.
Ad Featuring Stephens Credit Sales Mottoes
Ad Featuring Exact Replica Army Grenade
Ad Featuring Northwest Schools Training
Ad Featuring Tootsie [all other candies]
Ad Featuring Tootsie Roll
Ad Featuring Joe Weider Course and Products
Inside front cover.
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