Stalker is a Russian science fiction film directed by Andrei Tarkovsky. Set in a post-apocalyptic world, the film follows a guide, known as a Stalker, who leads two men through a mysterious and dangerous area called the Zone. Inside the Zone, their deepest desires and fears are brought to life. Stalker is a philosophical and visually mesmerizing film that explores themes of existentialism, spirituality, and the nature of reality. It is widely regarded as one of the greatest science fiction films ever made.