Crusade

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. In 2267 the Earth is quarantined, having been infected with a deadly plague by an attacking alien force. Scientists estimate that it will kill every inhabitant within 5 years, not nearly enough time for a cure to be developed. So the planet's only hope lies with the Excalibur, an advanced prototype starship sent out to search ancient alien ruins for their former inhabitant's secrets, hoping that somewhere out there a cure can be found.