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Cover: Neal Adams
Challengers of the Unknown #68
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In "One of Us Is a Madman!", the Challengers of the Unknown face a chilling mystery at a secret government lab where scientists have been killed. Written by Denny O'Neil and illustrated by Jack Sparling with inks by Vince Colletta, the story unfolds as the team confronts a terrifying electrical entity born from malfunctioning machines—only to discover that one of their own may be its unwilling host. The cover by Neal Adams captures the tension with striking, dynamic detail.
writer Denny O'Neil · artist Jack Sparling · inker Vince Colletta · letterer Milt Snapinn · cover Neal Adams
ComicBooks.com Value
Our Model is In Beta
Raw (VG) $5
CGC 9.6 · 3 in census $378*
CGC 9.4 · 5 in census $194*
CGC 9.2 · 2 in census $112*
CGC 9.0 none in existence
CGC 8.5 · 3 in census $52*
CGC 8.0 · 2 in census $40*
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Challengers of the Unknown January 1968 $9.99
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Full credits
writer Denny O'Neil
artist Jack Sparling
inker Vince Colletta
letterer Milt Snapinn
cover pencils, inks Neal Adams
Reprints
Reprinted in Aventures Fiction #35 (1974), Aventures Fiction #41 (1975)
Key issues in Challengers of the Unknown
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