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"Space: 1999" is a British sci-fi television series produced by MGM Television that aired from 1975 to 1978, comprising two seasons with 24 episodes each. Set in the distant future, it follows the crew of Moonbase Alpha, an isolated space station on the far side of the Moon, as they encounter various scientific anomalies and crises.

The series features an ensemble cast led by Martin Landau as Commander John Koenig and Barbara Bain as Dr. Helena Russell. Recurring characters include Maya, a mysterious alien played by Catherine Zeta-Jones in her film debut, Victor Bergman, an enigmatic scientist, and Paul Morrow, the base's engineer.

"Space: 1999" explores themes of suspense, mystery, and drama, often delving into moral dilemmas and human resilience. Its production is noted for high-quality visuals and special effects, though later episodes faced criticism due to inconsistent editing and direction, impacting its popularity.

In addition to the TV series, spin-offs like "Breakaway" (1975) and "Message from Moonbase Alpha" (1999) expand the universe. The show has a dedicated fan base and has been released on DVD with bonus content. Legal issues arose regarding unauthorized re-packaging for home video.

Overall, "Space: 1999" is celebrated for its ambitious storytelling and visual style, leaving a lasting impact on science fiction media.