A dark force threatens Alpha, a vast metropolis and home to species from a thousand planets. Special operatives Valerian and Laureline must race to identify the marauding menace and safeguard not just Alpha, but the future of the universe.

A marksman living in exile is coaxed back into action after hearing of a plot to kill the President. After being-double crossed for the attempt and on the run, he sets out for the real killer and the truth.