The universe will never be the same. Ariel has been captured by Nox, who plans on using her body to fuel a powerful device that will unleash unspeakable horrors into the universe. Meanwhile, on the Dark Planet, Nimue comes face to face with her past, and must make an unlikely alliance to save the universe. In the Celestial Realm, Kadlu and the resistance have plans of their own, and they don't involve allowing the universe to be invaded...