Sergeant O'Brien is one of several gate technicians at the SGC. When SG-1 was believed to have been captured by Ba'al, O'Brien received their IDC and audio contact and sent a hold signal awaiting orders from General O'Neill to open the iris for their return through the gate under fire.

Portrayed by: Pierre Bernard Jr.*
*Cameo by Pierre Bernard Jr.: Graphic Designer for Conan O'Brien

Cross Reference: Walter Harriman, Technicians

Episode Reference: Zero Hour