When the first edition of The Encyclopedia of Science Fiction was published in 1979, it was immediately hailed as a classic work of reference. Frank Herbert described it as 'the most valuable science fiction source book ever written' and Isaac Asimov said 'It will become the Bible for all science fiction fans.'. This new edition has taken years to prepare and is much more than a simple updating. The world of science fiction in the 1990s is much more complex than it was back in the late 1970s. The advent of game worlds, shared worlds, graphic novels, film and tv spin-offs, technothrillers, survivalist fiction, of horror novels and fantasy novels with of centres has necessitated a radical revision, and this has allowed the inclusion of related subjects, such as magic realism. Accordingly, the book has expanded dramatically in order to cope with the complexities and changes. It now contains well over 4,300 entries - a staggering 1,500 more than the original - and, at 1.2 million words, it is over half a million words longer than the first edition. This is the indispensable reference work not only for every reader who loves, uses and wishes to know more about science fiction, but for every reader of imaginative fiction at the end of this century.