This abundantly illustrated overview of lost, overlooked, and uncompleted works of science fiction and fantasy is a rich trove of imaginative worlds that few people have ever heard of. Among 80 articles, essays, and interviews—with contributions from Neil Gaiman, William Gibson, Lev Grossman, and Jeannette Ng—we find the futurist story that Jules Verne's editor rejected, prompting him to take up science fiction adventures instead. Here too are E.T.'s creepy origins; the far-reaching influence of artists Ralph McQuarrie, Syd Mead, and Moebius; the cyber attack training simulator CyberCity; and the science fiction songs of Janelle Monáe, blending Afrofuturism with themes from Metropolis.