When it was first broadcast in 1975, there had never been a more lavishly produced science fiction TV series than Space: 1999, a British production whose budget for the first of its two seasons ran an astounding 3.25 million pounds. What keeps us fans enthralled after all these years has only partly to due with the first-rate production values, the plausibly constructed spaceship models, and expert special effects. The tone of the show is one of scientific dispassion, setting it apart from its TV sci-fi predecessors such as Star Trek, whose mood was more convivial. Our heroes here are in dire circumstances that require cool heads as a survival trait. Those circumstances: the 311 crew members of Moonbase Alpha experience a cataclysm that causes the moon to break away from Earth's orbit and travel endlessly through space, turning our heroes into unintentional explorers. No TV series has created a more palpable feel of hard science fiction than this. Of course the show is not without its detractors; it has been soundly lambasted for its many scientific errors. No less august a figure than Isaac Asimov criticized the show for its premise in the opening episode, "Breakaway," which had nuclear explosions on the "dark side of the moon" somehow propelling it out of Earth's orbit and flying through space without regard to any physical laws. In "Earthbound" (included in this set), aliens traveling to Earth state it will take them 75 years to reach their destination, making one wonder why it didn't take the moon that long to encounter the aliens. While these are serious complaints, fans tend to remember the scientific seriousness of the series and the sense of awe created by the many strange creatures and phenomena that the crew members encounter on their journey through the galaxy. This set also includes the episodes "Ring Around the Moon" and "Another Time." --Jim Gay