An illustrated A-to-Z guide to all things alien. Over 400 entries from more than 100 contributors cover everything from the incidents and witnesses involved to the concepts at stake and experts' personal position statements. Entries range from alien abductions, the Fantasy Prone hypothesis and JAL Flight no 1628, to the Lakenheath-Bentwaters Episode, mind control by aliens and Roswell. The contributors include: Isaac Asimov, Jerome Clark, Erich von Daniken, Peter Davenport, Hilary Evans, Timothy Good, Marvin Kottmeyer, Jenny Randles, Carl Sagan, Whitley Streiber and Jacques Vallee. There are over 300 images, eyewitness drawings and photographs.