Daemon was the code name used by G.I. Joe recruit Jeff Lacefield. Growing up in Cincinnati, Ohio, Daemon was picked on relentlessly by other kids for his small frame and inability to take a joke. He found refuge in science fiction, comicbooks and videogames. From age 12, Daemon began learning all he could about computers and was constantly upgrading his system and teaching himself to program. By the time he graduated high school, he had become more of a normal kid, while still mastering computers. A master programmer by the time he was 21, he started creating computer viruses -- one of which made its way into the FBI's computer system. Daemon was arrested by the Feds, but they realized they could make use of his skills and he began working for the government.
He was put on temporary assignment with the G.I. Joe team to help put a stop to Cobra's nano-mites. He and fellow hacker, Firewall, both stayed with the team following the nano-mite threat and began working with the Joes' resident computer expert, Mainframe. Beach Head, the Joes' drill sergeant, began running the programmers through a training program should they ever see combat. Firewall mostly stuck to computers, but Daemon took up Beach Head's challenge and tried to make himself a soldier, despite his inherent awkwardness. He and Firewall used their skills to assist in several missions, including the fight to stop terrorist Tyler Wingfield. Daemon and Firewall displayed their immaturity when working together, with a relationship like two squabbling siblings.
Daemon continued to work on being a real member of the Joe team, and on his first field assignment, he -- along with Firewall -- helped drive the vehicle carrying a group of children who were revealed to be the clones of Serpentor. The Joes' convoy of vehicles was unexpectedly attacked by the forces of the revived Serpentor, known as The Coil. The main vehicle was torn to pieces and Serpentor arrived to liberate his brothers inside. When Daemon tried to stop him and as Firewall and Roadblock looked on, the former Cobra Emperor grabbed Daemon by the throat and snapped his neck, killing him. The remaining Joes were taken prisoner and held on Cobra Island until an invasion force arrived to battle The Coil. Some time after the battle on Cobra Island, at Arlington National Cemetery, Daemon's name was added to a new memorial dedicated to the fallen members of the G.I. Joe team. (v2 #3, 4, 10, 17, 22; FL 13)