Hadden is a Major in the United States Air Force and leader of SG-12. He and his team accompanied Teal'c to P9G-844 to investigate the Sodan distress call. Once there, he became trapped because Volnek removed the Control crystal from the Eye of the Gods transporter. He came up with the plan to use A-M18A1 Claymore mines to kill Volnek that Teal'c and Lt. Colonel Cameron Mitchell used to retrieve the crystal. (SG1: "Arthur's Mantle")