Works of science fiction and fantasy are enormously popular among students and general readers. The combined effort of some 150 expert contributors--including Richard Bleiler, John Clute, Ian Nichols, and Darrell Schweitzer--this encyclopedia discusses pervasive themes in science fiction and fantasy and gives detailed attention to selected novels, films, and television series. The first two volumes provide 400 alphabetically arranged entries on individual themes, while the last volume includes alphabetically arranged entries on 200 particular works. Accessible to a wide range of audiences, this encyclopedia is destined to be a favorite resource for anyone interested in fantasy and science fiction.