If a command center is heavily damaged, a queen may enter it and saturate the structure with parasitic bio-toxins. Once infested, the command center's occupants can be turned into mindless suicide soldiers. The structure itself comes to be tangled by orange and green vines, with "sacs of messy proto-somethings" along the walls.
Infested command centers are not built by drones. They are acquired by using a zergqueen's Infest Command Center ability on a terrancommand center with 750 or less hit points. The queen temporarily disappears into the command center; the structure then is transformed into an infested command center, followed by the reappearance of the queen a bit later. Queens automatically try to infest sufficiently damaged command centers when they are nearby. Once the infestation is complete, the infested command center is restored to 1500 hit points, regardless of how badly it was damaged before.
Infested command centers retain the Lift Off ability. They also regenerate health like zerg structures; infested command centers do not burn down after reaching critical health levels in the same way that other terran structures do. They can land on zerg creep and normal ground alike. Unlike regular command centers, they cannot accept Vespene gas or Minerals, nor are they restricted from being placed too close to vespene geysers or mineral nodes.
Infested command centers produce infested terrans. Production is sequential like in other terran structures, and does not consume larvae.
Infested command centers use the infested terran portrait instead of the zerg racial icon.
In the map editor, infested command centers normally look just like regular command centers, but are labelled "infestable infested command center". A tip notes that infested command centers "must be destroyed", indicating a player's command center could be infested under certain circumstances, requiring its destruction.
They do not produce any worker units. Instead, they produce Infested terran and infested marines at no cost (except a 2-second creation time) and aberrations for 6 seconds. These do not cost control. None of the three types of infested terrans have a limited lifespan.
Root: Roots the structure at a target location (on creep), allowing it to once again produce units, research upgrades, and use abilities. Uproot: Uproots the structure, allowing it to move about freely. May not produce units, research upgrades, or use abilities until it is rooted.