Hyatt was an airman of the United States Air Force and a member of Stargate Command. He was sent by Major Lowell to inform Major General George S. Hammond when Hathor tried to gain entry to the base. He later came under the influence of Hathor's Nish'ta and was guarding the female personnel of the base. The female personnel tricked him and another guard into the room where they overpowered them. (SG1: "Hathor")