Challengers of the Unknown #21 (1961) for Sale - Where to Buy

Identification plate

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Seq	Story	Type	Pages	Credits	Characters
0	The Challengers' Space-Pet Ally!	cover	1	pencils: Bob Brown; inks: Bob Brown; letters: Ira Schnapp
2	The Weird World That Didn't Exist	comic story	11.67	script: Ed Herron; pencils: Bob Brown; inks: Bob Brown; letters: Stan Starkman
4	Giant Superman Annual; Secret Origins	promo (ad from the publisher)	1
5	Mad Monarch of Burning Mountain	text story	1	letters: typeset
7	The Challengers' Space-Pet Ally	comic story	12.67	script: Dave Wood; pencils: Bob Brown; inks: Bob Brown; letters: Stan Starkman	Cosmo
8	Giant Batman Annual	promo (ad from the publisher)	0.5
10	-	comic story	0.67	script: Henry Boltinoff; pencils: Henry Boltinoff; inks: Henry Boltinoff; letters: Henry Boltinoff

Plus 7.49 pages of advertisements and other matter across 10 sequences, as published.

Collection	Year
Showcase Presents Challengers of the Unknown #2 ISBN 978-1-4012-1725-9	2008	On eBay ›

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Check spine ticks and cover gloss in the photos; silver-age Marvels chip at the edges easily.
Look for tanning at the page edges and transfer stains on the inside covers.
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