This movie is a prequell to the Babylon 5 series.
In it we find out about the Earth/Mimbari war,
and its long reaching reprucussions!
We start out in the year 2278, and Luc and Lyssa
venturing into the throne room of the Emporer of
Centauri, Londo Mollari. As he confronts the two
children, he starts the tale of the Earth/Mimbari
He tells of how Captain John Sheridan's heroics
in the war brought him to prominance, of the great
mistake that brought about the death and distruction
of many Mimbari and Humans, and of the discoveries
made during the war that finally brought it to an end.