Commander Dolim was a Xindi-Reptilian military officer, and a high-ranking member of the Xindi Council. In that capacity, he provided a voice pushing for the swift and total destruction of the Human species, in response to intelligence indicating that Humans would be responsible for the destruction of the Xindi homeworld in the 26th century.
Dolim was cold and bloodthirsty, and ruthless in his efforts. While conferring with fellow Council members regarding the deployment of the weapon designed to annihilate Earth, he voiced his intention of hunting down every Human settlement and refugee caravan, in an effort to ensure that no Humans survived the attack.
When the Xindi Council learned from the Guardians of the threat from Earth, Dolim became an advocate of swift and brutal action against the Humans, as a preemptive strike. He also pushed for the development of a bioweapon, in addition to the large-scale weapon being developed by Xindi-Primate Degra, although the Council disapproved this plan. Despite this, Dolim authorized one of his officers, Damron, to secretly begin working on the bioweapon, using physiological data provided by Rajiin, an alien female whom Dolim had placed on Enterprise NX-01 in 2153. (ENT: "Rajiin", "Carpenter Street", "The Forgotten")
While in the vortex, Dolim received a communication from the Insectoid vessel escorting the weapon, indicating that the Insectoids were beginning to doubt the Guardians' true intentions. Dolim responded to this by ordering the Insectoid ship destroyed, unwilling to risk any more interference in his mission to annihilate Earth. Upon emerging from the vortex, Dolim ordered the immediate destruction of the research post Yosemite 3. Immediately thereafter, Dolim's ship came under attack by an Andorian vessel commanded by Shran, who was attempting to assist the Humans in their efforts to stop the weapon. When Dolim realized, however, that the Andorians were attempting to provide cover for Captain Archer and a team from Enterprise to board the weapon, Dolim transported aboard and engaged in physical combat with Archer, attempting to prevent him from initiating a self-destruct. Dolim initially had the upper hand in the fight, possessing superior strength and stamina, but he was ultimately killed when Archer placed an explosive charge on his back and subsequently detonated it. (ENT: "Countdown", "Zero Hour")
