Galen leads the Excalibur on a mysterious errand deep into hyperspace, testing the limits of Captain Gideon's trust in him. Matheson is investigated by the telepath regulatory agency.
The Excalibur engages the Drakh in battle while on a secret mission. Dr. Steven Franklin comes aboard to study the plague, and makes a startling discovery.
The Excalibur is sent to evacuate a colony of humans who escaped Earth during the Drakh attack -- and who may be spreading the plague throughout the galaxy. Dureena discovers a link to her past.
Captain Gideon negotiates with a group of aliens to bring his team to their "sacred" planet, forcing he and Lochley to avoid an assassination attempt. Max goes to great lengths to save his ex-wife from a loan shark.
In the wake of the Drakh attack on Earth, Captain Gideon is assigned to the Excalibur to seek a cure for a plague that will wipe out all life on Earth. The ship follows up on a Drakh ship shot down on a deserted planet.
Gideon finds a lead on a Shadow-hybrid ship like the one that destroyed the Cerberus nearly 10 years ago, and risks the lives of his crew to track it and capture it.
A signal leads the Excalibur to a top-secret Earthforce research base, where Gideon risks his life and his career to find a connection to the destruction of the Cerberus -- and makes a shocking discovery about his own government, and his closest friend.