Space voyage to Jupiter turns chaotic when a computer, HAL 9000, takes over. Seen by some as a mirror of man's historical use of machinery and by others as a grim vision of the future, the special effects and music are still stunning. Critically acclaimed and well accepted by some, simply confusing to others. Martin Balsam originally recorded the voice of HAL, but was replaced. From Arthur C. Clarke's short story "The Sentinel."