This hardcover special edition, with a unique Challengers purple cover and foil-stamped "Jack Kirby's Challengers Of The Unknown Comic Book Legal Defense Fund Special Edition", was limited to 250 copies, and was offered by the Comic Book Legal Defense Fund (CBLDF) in 2017 as a premium to retailers that signed up for membership at the $250 Defender Level.
Collects Showcase #6-7, #11-12; Challengers of the Unknown #1-8. Printed on excellent uncoated white paper stock for excellent color quality-- rich warm flat color.