SG-13 was led by Colonel David Dixon with Dr. Cameron Balinsky, Senior Airman Jake Bosworth and Senior Airman Simon Wells. SG-13 were surveying the planet P3X-666 and found ruins that was of Ancient origin. They were there attacked by a Reconnaissance probe, much like the UAV in function. They destroyed the probe, but not before it had time to send out a subspace alert to the Goa'uld. Wells was injured in the attack. At an earlier time, they were surveying P2X-787 that they found similar to the above planet. (SG1: "Heroes, Part 1", "Heroes, Part 2")