Sarg was a Sontaran colonel who served as second-in-command to General Kade in the Fourth Sontaran Intelligence Division.
His attitude was typical of Sontaran combat personnel. He had presumably spent many years serving with one of the Sontaran Battle Fleets before being reassigned to the Fourth Sontaran Intelligence Division. Though his superior, General Kade, and he had the same goal (the defeat of the Rutan Host), their opinions differed on how best to achieve it. Kade believed the best way to defeat the Rutans was to learn as much as possible about their enemy. Sarg preferred brute military force.
He took part in the invasion of Chelsea 426, and was killed in a duel with General Kade after he challenged the General for command of the Fourth Sontaran Intelligence Division. (PROSE: The Taking of Chelsea 426)