Baker was a member of SG-3.
He was guarding the Stargate on Arkad's World, along with Colonel Albert Reynolds, when Teal'c came through intending to kill Arkad. Though assigned to stop Teal'c by any means necessary, Baker and Reynolds were both knocked unconscious by Teal'c and later found by Lt. Colonel Cameron Mitchell when they missed their routine check-in. (SG1: "Talion")