- "Two headed aliens, one head good, one evil."
- ―David Dixon[src]
Born in St. Paul, Minnesota in the United States of America on March 11, 1964, nothing is known of Dixon's early history until he joined the Minneapolis Police Department after leaving school. After this, he enrolled in the North Central University where he went on to major in Criminology. After graduating from this university, and at the age of twenty-five, he went on to join the United States Air Force where he rose through the ranks to become a Security Forces Officer, becoming an anti-terror expert whilst in this role. (SG1: "The DVD Collection 50")
Whilst serving as a major in the United States Air Force, Dixon was assigned temporary command of SG-2 whilst Major Louis Ferretti was in the infirmary following the Tau'ri's first visit to Chulak. (SG1: "Sacrifice Moon")
Some time later, Dixon, now the head of the strike team, was assigned, along with his men, to "plug the holes" made by the deaths of SG Team personnel in a turbulent time in the program's history. Dixon was sent to SG-1, officially as an observer, and helped secure a mining treaty on a planet named Adjo, with him and other SG-1 members briefly in danger of dying of a Goa'uld version of the bubonic plague. It was during this time that Lainie was expecting the couple's first child. (SG1: "Do No Harm")
Lainie later gave birth to Dixon's first child, a son, followed by another and then a third child which the couple hoped would be a daughter. They would even go on to have a fourth child, which led to Dixon loving his job for the time it gave him away, though he assured his team he loved them very much. Dixon was offered a permanent place at the SGC, which he eventually accepted, and became the commanding officer of SG-13. (SG1: "Heroes, Part 1")
On a mission to P3X-666, his team found ruins of an Ancient city. While exploring the ruins, they ran into a Goa'uld Reconnaissance probe that relayed their position before they could destroy it. Later the planet was attacked by Jaffa and Senior Airman Simon Wells was shot in the back by a staff weapon. He sent Dr. Cameron Balinsky back to Stargate Command to get reinforcements. When SG-1 arrived, he helped them fight off the Jaffa so Dr. Janet Fraiser could stabilize Wells. (SG1: "Heroes, Part 1", "Heroes, Part 2")
When Dr. Daniel Jackson and Teal'c tried to flee through the Stargate to P3X-500 in order to effect a rescue mission for the rest of SG-1, Dixon and his team caught them but didn't intervene even though they could've easily aborted the dialing sequence. Instead, Dixon had his team intercept the airmen trying to stop Jackson and Teal'c and give them weapons on the condition that they stunned them with a zat'nik'tel so they weren't court-martialed. While Jackson was stunned Dixon would break protocol like that, he was grateful and took what Dixon had to offer. When General Hammond personally led a small army of volunteers to Kinahhi to take over the gate room there and buy time for General Woodburn to stop Kinsey's plans, Dixon was one of the volunteers as well as his team. (SG1: "The Cost of Honor")
- In an alternate timeline where SG-1 were lost after their first mission post-Edora, Dixon was one of the survivors of the subsequent invasion of Earth by Apophis. Rather than leaving Earth, Dixon was entrusted by General Hammond with the responsibility to relocate the Beta gate to another part of the planet, leading to him establishing a new 'Stargate Command' equivalent in Scotland. Eventually, Dixon formed a tentative alliance with the Goa'uld Hecate after she took the body of Doctor Janet Fraiser as her host, working to protect Earth from the new threat of the Wraith. After Dixon died, his identity of the rebel leader 'Dix' was inherited by Rya'c, who used the name to honor Dixon's memory and continue to fight for Earth as his father had done. (Stargate SG-1: Apocalypse).
|Current members||Cameron Mitchell - Daniel Jackson - Teal'c of Chulak - Vala Mal Doran|
|Former members||Fred Buonarotti - Samantha Carter - Castleman - David Dixon - Hagman - Robert Makepeace - Mathison - Jonathan J. O'Neill - Jonas Quinn|