In an attempt to understand the nature of the Drakh virus better, the Excalibur is sent back to Earth's orbit for a top-secret special pick up. Familiar face returns. The show ends on an open ending.
Two persecuted alien investigators (based on FBI agents Mulder and Scully from X-Files) believe that Earth is covertly invading them.
Gideon conducts an illegal raid to free a fugitive with information that could save Earth.
Galen warns Gideon not to explore a planet where the inhabitants were suddenly eradicated.
Gideon and crew find themselves trapped by an alien civilization using sinister methods to seek a cure for the same Drakh virus that attacked Earth.
Gideon must outwit an alien consciousness that takes over the Excalibur's crew.
Gideon and Lochley must prevent a doomsday cult from killing everyone at a virus conference on Mars.
Gideon must deport a colony of renegade humans. Dureena finds a lost tribe of her people.
A mysterious sphere prompts Gideon and the others to relive traumatic moments from their past.
Galen persuades Gideon to seek a mystical crossroads. An investigator probes Matheson's mind.
Crusade is an American spin-off TV show from J. Michael Straczynski's Babylon 5. Its plot is set in AD 2267, five years after the events of Babylon 5, and just after the movie A Call to Arms. The Drakh have released a nanovirus plague on Earth, which will destroy all life on Earth within five years if it is not stopped. To that end, the Victory class destroyer Excalibur has been sent out to look for anything that could help the search for a cure.