Parasite
A Queen always commands the ability to launch a tiny Parasite over long range against the enemy unit of choice. Parasite costs only 50 points of energy to use and may be fired on the target from a very long range. After attaching a Parasite to a target, the Zerg can see through its eyes and gather reconnaissance in this way. Parasite is excellent to use against enemy worker units and transports or otherwise any members of the enemy garrison. If you cast a Parasite on an enemy unit with cloaking ability, it will always appear visible to your forces. Likewise, using Parasite on an enemy cloak detector unit will reveal any cloaked enemy units near to it. Send the Queen to scout enemy territory, then affix Parasites onto any units you find. A Parasite cannot be removed. Only the death of its host will negate its effects.

Spawn Broodlings
You must research the Spawn Broodlings ability from your Queen's Nest before you can use it. Spawn Broodlings cost 150 energy points per use and kills the target instantly as its body fatally fertilizes two weak Zerg creatures. The Broodlings themselves are easily killed. Spawn Broodlings only affects organic ground units. They does not affect flying units of any sort, and other exceptions include Protoss Reavers, Probes, and Archons. However, Spawn Broodlings instantly kill such powerful and expensive units like Terran Siege Tanks, Protoss High Templars, and Zerg Ultralisks, making the Queen a powerful force indeed. The power of this ability is obvious.

Ensnare
You must research Ensnare at your Queen's nest before you can employ this power. For 75 points of energy, the Queen can secrete sticky green spores over great distances that coat all units in the area in a substance that significantly slows their rate of fire and movement. Use this ability against closely knit packs of enemy units to make them far less effective in battle, thus giving your own forces the upper hand. Ensnare works great against flying units - slow them down, then send in the suicidal Scourge to finish them off. Ensnare can also reveal cloaked units. If you see the shimmer effect of an invisible unit, cast Ensnare upon in. The green goo will not only slow the cloaked unit down, but reveal it to your forces. Be careful when using this ability, however, as it will slow your own units caught in the area of effect. The effects of this ability wear off after a while.

Infestation
The Queen has the ability to take over a Terran Command Center. You won't have the chance to use Infestation often, but if you're able to damage a Terran Command Center to half its strength or below, you may order a Queen to infest it. The process is almost instantaneous. The resulting Infested Command Center is now yours to control and may fly about like many other Terran facility. The structure is used to produce Infested Terrans who charge at their target and explode, dealing tremendous damage.

You may also upgrade a Queen with Gamete Meiosis, which increases her energy capacity by 50 points. Because her abilities are so widely useful, this upgrade is a good idea. Always consider Queens in your long-term strategy.

Broodling

Strengths: No cost to produce; fast moving; can draw enemy fire Weaknesses: Easily killed; physically weak

Broodlings are weak and easily killed and die off after a while, even if the enemy doesn't get to them first. Most of the time, your best course of action is simply to let them follow their instincts and distract nearby opponents from your more valuable forces. Consider Broodlings a bonus to the Queen's already powerful ability to kill many types of ground units in a single stroke.

Next: Defiler