A mysterious sphere prompts Gideon and the others to relive traumatic moments from their past.

Gideon must deport a colony of renegade humans. Dureena finds a lost tribe of her people.

Gideon and Lochley must prevent a doomsday cult from killing everyone at a virus conference on Mars.

Gideon must outwit an alien consciousness that takes over the Excalibur's crew.

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.

Galen warns Gideon not to explore a planet where the inhabitants were suddenly eradicated.

Gideon conducts an illegal raid to free a fugitive with information that could save Earth.

Two persecuted alien investigators (based on FBI agents Mulder and Scully from X-Files) believe that Earth is covertly invading them.

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. Final, open-ended, episode.