The film features an international cast with several high-profile cameos:
The film ends with Valerian and Laureline defying orders. They return the stolen converter to the Pearls, which regenerates their home planet’s core. Instead of punishing them, the Federation Commander thanks them, and the two agents request to be stationed on Alpha permanently. The final shot is the two of them walking into the depths of the city, ready for new adventures—a perfect setup for a sequel that will likely never happen.
Furthermore, the converter creature represents natural resources. The human military wants to exploit it for unlimited energy; the Pearls need it to heal their dead planet. Besson is unsubtle: unchecked imperialism leads to mutual destruction. It is a rare blockbuster where the human government is the unambiguous bad guy, and the "aliens" are unequivocally the victims.
[Outro] (G - G7 - C - C7)