Stalker is a Russian science fiction film directed by Andrei Tarkovsky. It takes place in a post-apocalyptic world where a guide, known as a Stalker, leads a writer and a scientist into a mysterious and dangerous area called the Zone. The film delves into philosophical questions about the nature of reality, desire, and the human condition. Stalker is considered a masterpiece of Russian cinema and a must-watch for fans of thought-provoking science fiction.