In 1968, a killer supercomputer named HAL 9000 gripped imaginations in the sci-fi thriller “2001: A Space Odyssey.” The dark side of artificial intelligence (AI) was intriguing, entertaining, and completely far-fetched. Audiences were hooked, and numerous blockbusters followed, from “The Terminator” in 1984 to “The Matrix” in 1999, each exploring AI’s extreme possibilities and potential consequences. A decade ago, when “Ex Machina” was released, it still seemed unimaginable that AI could become advanced enough to create widescale havoc.