Photo by K. Kitts of her original Valerian no. 6 L’Ambassadeur des Ombres.
Warning: There be spoilers unless you are a Valerian and Laureline fan and already know the story.
The movie more or less uses the plot of the sixth graphic novel from the series titled Ambassador of the Shadows with an cameo of the natives from Avatar. The title of this movie is lifted from the second novel likely because it sounded bigger.