According to Babylon 5 canon, the original Drakh plan had been to use the Death Cloud on Earth, and then use the plague on Minbar. However, when the Death Cloud was destroyed, the plague was the only significant weapon they had left.
The film takes place from December 17 to December 30, 2266.
In the original storyline, there was a subplot in which Drake plans to marry the love of his life are thwarted when someone else proposes to the woman first.
During the evacuation from the planet-killer, a Warlock destroyer can be briefly seen.