Control

Control is a term used in the StarCraft series determining the size of a Zerg force.

All Zerg are directly subject to the will of the Overmind; it is a biological impossibility for them to oppose its directives. Only Cerebrates (smaller brains), and possibly Overlords and Queens, have sentience, and control a different army (called a Brood), using Overlords as lieutenants to directly control the warriors and workers. The lesser Zerg minions are wholly dependent upon the Cerebrates and the Overlords for order. Should a Cerebrate die, its brood may run amok; the animalistic nature of individual Zerg emerges.

Each Zerg player has two Control counters - the first refers to the amount of control being used by the player's units and the second refers to the amount of total control available. The difference in the two numbers is the amount of control that is still available for spawn additional units. In the context of a multiplayer match, when an Overlord dies, a Zerg player loses Control points, and must grow more Overlords to replace the loss. Once the difference in the two numbers reaches zero, a player will not be able to spawn any additional units (except Overlords and Larvae). Hidden is a 200 point Control max, the limit beyond which your production structures can no longer turn out units no matter how many control production objects you create.

Zerg structures are alive but do not require Control.

Control is the Zerg equivalent of Supply.

Here is a list of how much Control each unit takes in StarCraft I:

Control required	Units
0	Larva, Broodling
½	Zergling, Scourge
1	Drone, Hydralisk, Infested Terran
2	Lurker, Defiler, Mutalisk, Guardian, Devourer, Queen
4	Ultralisk

Units providing supply in StarCraft I:

Control provided	Units
8	Overlord (Note: Hero Overlord, Yggdrasill, provides 30)
1	Hatchery, Lair, Hive

Here is a list of how much Control each unit takes in StarCraft II:

Control required	Units
0	Larva, Broodling, Infested Marine, Queen in StarCraft II, Large Queen, Huge Queen, Changeling, Swarm
½	Zergling
1	Drone, Baneling, Roach, Mutant Larva
2	Lurker, Corruptor, Mutalisk, Infestor, Swarm Guardian
4	Ultralisk

References

Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn. StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.