Colonel Barnes had been the commanding officer of SG-6. His team, including Lieutenant Fisher, Lieutenant Brooks, and Airman Ryan, had been operating undercover on P2X-885, a poverty-stricken world that had fallen to the Ori. While off-world, Fisher and Ryan had attended morning prostration, and as the Prior was preaching, he had touched Fisher on the head, making him a carrier for the Prior plague that would be brought back to Earth. After returning to the SGC, Colonel Barnes was the first to exhibit symptoms including fatigue, high fever, chest pain, and respiratory distress. His illness was diagnosed as the Prior plague by Dr. Lam, and he was quarantined in the infirmary for treatment.
Portrayed by: Ty Olsson
Cross Reference: Lieutenant Fisher, Prior Plague, SG Teams
Episode Reference: The Fourth Horseman