Gilson the Evil

Gilson the Evil is a Zerg Guardian that somehow possesses free will, a name, individuality and even the ability to 'speak'. He leads a mercenary group known as Gilson's Opressors. He appears in Mercenaries.

Freedom
Theoretically, the earliest that Gilson could have broken away from the Swarm would be after the destruction of the original Overmind. A power vacuum existed within the Zerg Swarm, one which had the Zerg running rampant. Although Infested Kerrigan eventually rose to the position of ruler of the Zerg, it is unlikely that the extent of her control is on the same level of the Overmind, thus allowing Gilson's independence.

Mercenaries
By the end of the Brood War, Gilson came to lead a group of Zerg mercenaries known as Gilson's Operessors. He offerred his services to the Terran Dominion to deal with the New Trinidad Pirates.