Each volume reprints out-of-print back issues, plus a significant amount of previously unpublished material. All the Collected Jack Kirby Collectors are now out-of-print themselves.

From the publisher:

Kirby fans demanded more, so this fifth volume is a gargantuan 224-page trade paperback, reprinting the sold-out issues #20-22 of The Jack Kirby Collector, the critically-acclaimed magazine for Kirby fans! Included are the "Kirby's Women," "Wackiest Work" and "Villains" issues, featuring three unseen interviews with Jack Kirby, plus new ones with Jack's daughter Lisa Kirby, and industry pros Dave Stevens, Gil Kane, Bruce Timm, Steve Rude and Mike Mignola! Plus: see a complete ten-page unpublished Kirby story still in pencil! Jack's mind-blowing original pencils to Fantastic Four #49 (from the fabled Galactus trilogy)! An analysis comparing Kirby's margin notes to Stan Lee's dialogue on classic Marvel comics! And a new special section with over 30 pieces of Kirby art never before published, including Jack's un-inked pencils from The Demon, Forever People, Jimmy Olsen, Kamandi, Eternals, Captain America, Black Panther and more! With page after page of rare Kirby art (much in its original pencil form), and a dynamite Kirby/Dave Stevens cover, it's a celebration of the most prolific creator in comics history: Jack "King" Kirby!