Book excerpt: It's a bird! It's a plane! It's a complete guide to over 50 years of superheroes on screen! This expanded and updated edition of the 2004 award-winning encyclopedia covers important developments in the popular genre; adds new shows such as Heroes and Zoom; includes the latest films featuring icons like Superman, Spiderman and Batman; and covers even more types of superheroes. Each entry includes a detailed history, cast and credits, episode and film descriptions, critical commentaries, and data on arch-villains, gadgets, comic-book origins and super powers, while placing each production into its historical context. Appendices list common superhero conventions and cliches; incarnations; memorable ad lines; and the best, worst, and most influential productions from 1951 to 2008.