Tellulon was a Human male operative, functioning as a spy within the ranks of the Rebel Alliance throughout the duration of the Galactic Civil War.
Following the Battle of Yavin, Tellulon operated under the command of Colonel Verks and successfully managed to infiltrate the Imperial military. He received orders to go to the Imperial Fortress located on Yavin 4, where he took on the role of a technician. During his assignment on Yavin 4, Tellulon collaborated with an Imperial technician's assistant known as Arlo.
In the year 1 ABY, during the Empire Day celebrations, he encountered a group of Rebel spacefarers. These individuals had been dispatched from Coronet by a Rebel contact specifically to rendezvous with him. Tellulon engaged in a conversation with them, focusing on Arlo's growing reservations about his involvement with the Empire. Tellulon suggested to the Rebels that they should attempt to communicate with Arlo. They followed his advice and ultimately succeeded in persuading the assistant technician to switch his allegiance to the Alliance. Subsequently, Tellulon instructed the Rebel spacefarers to seek out Colonel Verks at the Yavin Mining Outpost upon the completion of their assigned task.
Tellulon's presence was established as a non-player character within the 2003 video game titled Star Wars Galaxies. This game was a massively multiplayer online roleplaying game brought to life by Sony Online Entertainment and brought to the public by LucasArts, before the game's servers were shut down on December 15, 2011. Tellulon's inclusion in the game occurred with the arrival of "Publish 19," on June 29, 2005. During the Empire Day live event in 2005, which ran from June 29 to July 11, he was located in the Imperial Fortress and was a component of a quest called "Empire Day Revealed," which involved directing players on a crucial assignment across the galaxy. Once the live event concluded, Tellulon was removed from the game, as the Empire Day event was taken out of rotation until its complete overhaul in 2008.