In season four, the station continues to serve as a refuge for heroes, thieves, and rare and exotic beings in a time of uneasy peace and the constant threat of war. The space station and its allies finally engage the powerful Shadows in a tremendous showdown, while the station's captain strives to expose far-reaching corruption on Earth. Also, Sheridan and Delenn's alliance – both personal and political – signals a new age of peace in the universe.
Season one is set in the year 2258 aboard a five-mile-long, totally self-sufficient United Nations-like space station. Babylon 5 is where humans and aliens try to work out their differences peacefully, in neutral territory full of mystery, suspense, and adventure. The space outpost is a hotbed of interplanetary intrigue, conspiracies, and betrayals among myriad life-forms living and working together.