In the 28th century, special operatives Valerian and Laureline are charged with preserving law and order throughout the expansive human territories. While on a mission from the Minister of Defense, they arrive at Alpha, an immense metropolis that attracts species from every corner of the universe. Over centuries, Alpha has grown into a bustling convergence of knowledge, intelligence, and diverse cultures. However, a mysterious dark force threatens the peaceful harmony of this City of a Thousand Planets, and Valerian and Laureline have a mandate not just to identify the menace but also to ensure the safety of Alpha and the entire universe.