Colonel Johnson is an officer stationed at the SGC. With his background in science and medicine, he was a part of the team cooperating with Carter and Orlin to isolate the virus responsible for the Prior plague that had spread to Earth, and to synthesize a cure. He was skeptical of Orlin's contribution, especially in his weakened state, and he was particularly angered when a blood sample was accidentally spilled, setting back their work.
Portrayed by: Kurt Evans
Cross Reference: SG Teams
Episode Reference: The Fourth Horseman