Based on Philip K. Dick's novel, "A Scanner Darkly" is a rotoscope-animated sci-fi thriller directed by Richard Linklater. Set in a dystopian future where an undercover cop (Keanu Reeves) becomes addicted to a dangerous substance while surveilling drug users, the film blurs the lines between reality and hallucination. Linklater's innovative animation technique adds a surreal quality to the narrative, enhancing its exploration of surveillance, addiction, and the erosion of personal identity in a surveillance state.