David, a young farmer from Cantal, has just had an idea: to save his farm from bankruptcy, he is going to set up a cabaret on the farm. The show will be on stage and on the plate, with good local products. He is sure, it can only work. His relatives, his mother and especially his grandfather, are more skeptical.

In the 28th century, Valerian and Laureline are special operatives charged with keeping order throughout the human territories. On assignment from the Minister of Defense, the two undertake a mission to Alpha, an ever-expanding metropolis where species from across the universe have converged over centuries to share knowledge, intelligence, and cultures. At the center of Alpha is a mysterious dark force which threatens the peaceful existence of the City of a Thousand Planets, and Valerian and Laureline must race to identify the menace and safeguard not just Alpha, but the future of the universe.

In the wake of their parent's separation, three siblings spend the summer in the south of France with their estranged Grandfather. In less than 24 hours, a clash of generations has occurred between the teenagers and the old man. During this turbulent summer, both generations will be transformed by one another.