Broken-horned zergling

A broken-horned zergling was often seen in the company of Sarah Kerrigan during the second phase of the Second Great War.

Origins
The zergling was a member of the Naktul Brood, either spawned during the arrival of the former Queen of Blades on Phaethon, or a pre-existing organism. Regardless, it took part in the mission to eradicate the Terran Dominion presence on the world. After the battle, the zergling proceeded to enter the special ops dropship its queen was using. Kerrigan reacted with hostility at first, drawing a C-10 rifle on it, but lowered her weapon. It remained with her after she chose to continue her course of vengeance.

Hound of the Swarm
The zergling was present on Char when Kerrigan sent her forces against General Horace Warfield. The zerg overran Warfield's compound and Warfield was impaled on a support beam, disabling him. The zergling advanced on the terran, but stood aside to let its queen deliver the coup de grace.

The zergling was present with Kerrigan when the Dark Templar Zeratul appeared inside her leviathan. It stood aside as its queen and the protoss battled.