Following the attack on Earth by the Drakh, a plan is hatched to save it. Excalibur, a new vessel, is sent out to find a cure for the plague, and the man for the job is Captain Matthew Gideon. His first act is to capture one of the Drakh and get him to tell him what he can.
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This takes place from January 1 to January 5, 2267. See more
The alien forces that attacked Earth struck without reason or provocation. Although they were driven back by our forces, on their way out, they left behind a biogenetically engineered virus that has completely penetrated the atmosphere. As a result, Earth has been quarantined. Repeat: Earth has been quarantined.
References Babylon 5: A Call to Arms