A mind-bending sci-fi symphony, Stanley Kubrick’s landmark 1968 epic pushed the limits of narrative and special effects toward a meditation on technology and humanity. Based on Arthur C. Clarke’s story The Sentinel, Kubrick and Clarke’s screenplay is structured in four movements. At the “Dawn of Man,” a group of hominids encounters a mysterious black monolith alien to their surroundings. To the strains of Strauss’s 1896 Also sprach Zarathustra, a hominid invents the first weapon, using a bone to kill prey. As the hominid tosses the bone in the air, Kubrick cuts to a 21st century spacecraft hovering over the Earth, skipping ahead millions of years in technological development. U.S. scientist Dr. Heywood Floyd (William Sylvester) travels to the moon to check out the discovery of a strange object on the moon’s surface: a black monolith. As the sun’s rays strike the stone, however, it emits a piercing, deafening sound that fills the investigators’ headphones and stops them in their path. Cutting ahead 18 months, impassive astronauts David Bowman (Keir Dullea) and Frank Poole (Gary Lockwood) head toward Jupiter on the spaceship Discovery, their only company three hibernating astronauts and the vocal, man-made HAL 9000 computer running the entire ship. When the all-too-human HAL malfunctions, however, he tries to murder the astronauts to cover his error, forcing Bowman to defend himself the only way he can. Free of HAL, and finally informed of the voyage’s purpose by a recording from Floyd, Bowman journeys to “Jupiter and Beyond the Infinite,” through the psychedelic slit-scan star-gate to an 18th century room, and the completion of the monolith’s evolutionary mission.