Crusade, a spin-off from the Emmy-winning Babylon 5, describes the efforts of the Interstellar Alliance vessel Excalibur to find the cure to a plague released on Earth. This plague of nano-viruses, released by the Shadow's servants the Drakh in retaliation for the Shadow War will kill all mammalian life on Earth within five years if the cure is not found.
It was the Dawn of the Third Age of Mankind, ten years after the Earth-Minbari War. The Babylon Project was a dream given form. Its goal: to prevent another war by creating a place where humans and aliens could work out their differences peacefully. It's a port of call, home away from home for diplomats, hustlers, entrepreneurs and wanderers. Humans and aliens wrapped in two million, five hundred thousand tons of spinning metal .. all alone in the night. It can be a dangerous place, but it's our last, best hope for peace. -- This is the story of the last of the Babylon stations. The year is 2258. The name of the place is Babylon 5.