Lab Specimen U-23A

Lab Specimen U-23A is an ultralisk that was shackled and researched by Terran Dominion scientists within the Castanar installation.

Game Unit
Lab Specimen U-23A appears in "Piercing the Shroud" as "Shackled Ultralisk," and while it serves no function on the map, when destroyed it will spawn three broodlings. The model for U-23A reappears in "Ghost of a Chance," though it is unattackable. The model also reappears in the Heart of the Swarm mission "Phantoms of the Void," when the first ultralisk is reconstituted, and in the ultralisk evolution mission where several break out of restraints during the Noxious portion of the mission.