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.
Babylon 5 is a five-mile long space station located in neutral space. Built by the Earth Alliance in the 2250s, its goal is to maintain peace among the various alien races by providing a sanctuary where grievances and negotiations can be worked out among duly appointed ambassadors. A council made up of representatives from the five major space-faring civilizations - the Earth Alliance, Minbari Federation, Centauri Republic, Narn Regime, and Vorlon Empire - work with the League of Non-Aligned Worlds to keep interstellar relations under control. Aside from its diplomatic function, Babylon 5 also serves as a military post for Earth and a port of call for travelers, traders, businessmen, criminals, and Rangers.
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.
After being punished for retreat from combat, Ranger David Martel is given command of the Liandra, a haunted 20-year old Minbari fighting ship. He's escorting ambassadors to a secret archaeological site, the oldest city on record and a clue to a dangerous ancient race.
It's the tenth anniversary of the Interstellar Alliance, and President Sheridan is on his way to Babylon 5 for the celebration. However, he must first deal with a threat from the future, while Lochley handles a case of demonic possession.