One of two races living on M4D-058, the other being the Hallonans, who were, unknowingly, taking part in some form of social experiment run by the Ancients. Using a console based in Atlantis instructions were sent via a series of satellites to display tables in the two villages. The leaders of the villages then instructed the people how to live their lives. Once the Ancients departed Atlantis, however, the instructions stopped and the people were left in limbo.
Shortly after the arrival of Earth's Atlantis expedition, the console was discovered by John Sheppard and Rodney McKay who, thinking the machine was a game, began sending instructions again. McKay chose to name the area he controlled Geldar after a girl he knew in school, and instructed them in rapid scientific growth. Sheppard took control of Hallona and taught them to be more militaristic.
Eventually the two men realized what was happening when Major Lorne visited the planet and found that the Hallonan flag had McKay's face on it. By then, however, the competitive natures of the two men had pushed the two people to the brink of war, which the team had to work hard to avert.
The leader of the Geldarans was a woman called Nola.
The Game - McKay and the rest of the team visit his kingdom, where he is hailed as "The Oracle."