Cover pencils by Jack Kirby. Origin and first appearance of Challengers of the Unknown in The Secret of the Sorcerer's Box (Chapter 1), script by Jack Kirby (plot, script) and Dave Wood (script), pencils by Jack Kirby; Four heroes are being flown to appear on the radio show "Heroes" when their jet crashes in a storm; Miraculously, all four survive unharmed, even down to a working watch; First Silver Age hero team and first original concept Silver Age series. Shorty humor page by Henry Boltinoff. Whistle Magic! fact page by Mort Drucker. Dragon Seed! (Chapter 2), script by Jack Kirby (plot, script) and Dave Wood (script), pencils by Jack Kirby; The Challs relocate the box to a tropical island and draw straws; The first chamber releases a "Dragon's Egg" that hatches a stone giant of legend. Moolah the Mystic humor page by Henry Boltinoff. The Freezing Sun! (Chapter 3), script by Jack Kirby (plot, script) and Dave Wood (script), pencils by Jack Kirby. I Fought the Phantom Planes text story. The Whirling Weaver! (Chapter 4). First Silver Age hero team and first original concept Silver Age series. Reprinted in Challengers of the Unknown 64-65. 36 Pages, Full Color. Cover price $0.10. Grade: CGC 5.5 explanation of grade Condition: Used (collectible)