Four years before Jack Kirby and Stan Lee created Marvel's Fantastic Four, there was another adventurous foursome co-created by Kirby that set forth to challenge the unknown. It was a concept way ahead of its time. The Challengers were Ace Morgan (crackerjack test pilot), Red Ryan (daredevil and mountain climber), Rocky Davis (heavyweight boxing champ) and Prof Haley (scientist specializing in underwater exploration) - four men who barely survived the crash of a small aircraft and now considered themselves to be living on borrowed time! Because they managed to avoid such a devastating fate, they dedicated themselves to a life of harrowing adventures, all in the name of good! Nothing was deemed too dangerous for the Challengers - after all, they should have been dead already. Debuting in the tryout comic Showcase, they quickly graduated to their own monthly comic, where the foursome faced the impossible and the unimaginable at every turn. In this second volume, we present the second six comics featuring the Challengers by Jack Kirby: Challengers of the unknown Nos. 3-8. And, making this volume even more special, Kirby is inked by fellow comics legend Wally Wood - a pairing of two of the greatest illustrators in comics! Book jacket.