Overseer

The overseer was a zerg strain evolved from the overlord, bred by the Swarm to serve as its eyes. Studded with highly evolved optical receptors, it could pierce camouflage and cloaking, and through incorporated terran DNA it could spawn the infiltrators known as changelings.

A creature bred to see#

Overseers were genetically altered overlords with a mass of additional sockets filled with highly evolved optical receptors and hypersensitive retinas. Like overlords, and unlike most other zerg breeds, they could act with appropriate judgment, though they were severely limited in their mental flexibility.

The zerg were obsessed with detecting subtler motions and more advanced camouflage, and the overseer's eyes passed through many iterations, each developmental cycle improving on the last. The first batch ended up crippled and blind when the microscopic filaments that relayed sensory and spatial data, located on the creature's vestigial legs, gained sentience and consumed the appendages that housed them. To correct this, the legs were excised and the filaments transformed into long, fleshy tendrils grown from the carapace. When an overlord is subjected to the overseer strain mutation, its eyes melt into a luminescent substance floating inside a semi-transparent skull, from which sensory tentacles and twin photoreceptors capable of sight in any environment sprout between the openings of a thick, armored faceplate. The main body then expands and grows six new hypersensitive optical receptors in strategic positions. This evolution let the overseer detect any hidden enemy, including those burrowed underground or cloaked, and overseers were capable of hearing, processing, and understanding terran speech.

Changelings and specialized strains#

By incorporating terran DNA into the overseer's genetic makeup, particularly during its later stages of pupation, the creature displayed a peculiar evolution. Its creep glands expanded into stores of sentient, unfertilized bio-matter, and its organs no longer liquefied into creep but into a nourishing paste. At the overseer's will, this paste bonded with the bio-matter to become an insidious infiltrator known as the changeling. The bio-matter also grew and solidified at exponential rates when exposed to foreign atmospheres, a trait the Swarm exploited to disable critical facilities in the midst of an invasion.

Several specialized strains existed. The primal zerg packs adapted overseers into their genome, though they were among the rarest of primal breeds. The fins and tendrils of the Leviathan Brood overseers were bred for reconnaissance, cutting through air and water with minimal effort. Overseers enslaved by the Cerberus Program were enhanced with void sensor technology designed by Dr. Rudolfo Subsourian, which let them triangulate the exact position of a cloaking effect within twenty kilometers.