Crusade

The Earth repels a savage attack by the Drakh, but not before the alien force has unleashed a deadly biogenetic plague on the planet. Only five years remain for the inhabitants of Earth unless an Alliance ship, the Excalibur, succeeds in its quest to find a cure for the mutating plague. Excalibur, led by commanding officer Captain Matthew Gideon, visits and explores new worlds, encountering ancient cities and artifacts that could mean life or death for the dying planet Earth.