Barnes
From The Stargate Omnipedia
Colonel, commander of SG-6. He and his unit were sent undercover to P2X-885 to monitor the activity of the Ori Priors and their efforts to convert the population to Origin.
After returning to Earth he went to the medical ward complaining of fatigue. Roughly an hour later he could barely stand. He soon had symptoms of high fever, chest pain, and respiratory distress (identical to the symptoms experienced by the people of P8X-412). Dr. Lam was certain he had become infected by a Prior plague.
DETAILS
PLAYED BY - Ty Olsson
FIRST APPEARED - The Fourth Horseman, Part 1
KEY EPISODE
The Fourth Horseman, Part 1 - Hours after returning to Earth from a long-term undercover mission, Colonel Barnes begins to display symptoms of a Prior plague.