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.