An archaeologist arrives at Babylon 5 with a grave massage: a dormant Shadow ship has been found on Ganymede. It must be destroyed before it falls into the hands of President Clark.

A mysterious man comes to Babylon 5 dressed in chainmail and armed with a sword. His name? King Arthur - Son of Uther Pendragon, come to help when he is needed most.

Ivanova gets a distress call from herself pleading for help as the Shadows destroy Babylon 5. It is dated eight days into the future. At the same time, on Minbar, Sinclair is given a nine-hundred-year-old letter from Valen, telling him that a drastic action must be taken to prevent that future.

Londo forces Vir to participate in a plan to kill G'Kar. Sheridan struggles with figuring out the Shadows' tactics.