After a short absence from Babylon 5, Michael Garibaldi returns to the station to meet with a person in his employ. An archaeologist in search of a means of immortality brings his most recent find to Babylon 5 - an orb containing one billion souls of an extinct race.
Within days a Soul Hunter arrives claiming the orb was stolen from his people. With the assistance of the archaeologist the souls break free from their captivity in the orb and bring havoc to the station.