IMDB page
A small info trailerTime-traveling agent Valerian is sent to investigate a galactic empire, along with his partner Laureline.
The WIKI which shows a cast list. Some seem a strange choice.
Dane DeHaan[4] as Valérian
Cara Delevingne[4] as Laureline
Clive Owen[4] as Commander Arün Filitt
Sam Spruell as General Okto Bar
Rihanna[5]
Ethan Hawke[4]
John Goodman
Alain Chabat
Mathieu Kassovitz
Herbie Hancock[5]
Kris Wu[6]
Rutger Hauer
And the IGN link where I found the story and its poster for Comic Con
Rooted in the classic graphic novel series, Valerian and Laureline -- visionary writer/director Luc Besson advances this iconic source material into a contemporary, unique and epic science fiction saga.
Valerian (Dane DeHaan) and Laureline (Cara Delevingne) are special operatives for the government of the human territories charged with maintaining order throughout the universe. Valerian has more in mind than a professional relationship with his partner, blatantly chasing after her with propositions of romance. But his extensive history with women, and her traditional values, drive Laureline to continuously rebuff him.
Under directive from their Commander (Clive Owen), Valerian and Laureline embark on a mission to the breathtaking intergalactic city of Alpha, an ever-expanding metropolis comprised of thousands of different species from all four corners of the universe. Alpha's seventeen million inhabitants have converged over time -- uniting their talents, technology and resources for the betterment of all. Unfortunately, not everyone on Alpha shares in these same objectives; in fact, unseen forces are at work, placing our race in great danger.