StarCraft II: Wings of Liberty/Zerg units

Drone


Can gather resources and turn into structures.

Baneling
The Baneling is a wheel-shaped explosive Zerg strain descended from the Zergling. Banelings roll around the battlefield and kill opponents with a low-damage suicide attack caused by their explosive body chemistry.

Banelings are strong against melee units but are weak against ranged weapons due to their low hit points. A Nest is required to spawn them, which also provides upgrades.

Its splash damage does not hurt friendly units.

Brood Lord
Brood Lords take the role of the old Guardians and Swarm Guardians, but with powerful buffs. They have 350 HP and 9 range, with each explosive glob dealing 25 damage. Each attack will also spawn a Broodling.

Corruptor


Strong anti air flyer. This creature might have the ability to make enemies take more damage and might cover buildings in slime which prevents them from functioning.

Hydralisk


Their appearance have changed slightly in StarCraft II. The most notable difference is their scythes, which now boast more spikes than in StarCraft. Their face is also slightly different from what it was before.

The Hydralisk is protected by light armor.

Infested Terran
The Infested Terran is a different unit than StarCraft's unit of the same name; they're essentially regular Marines with Zerg appendages, so instead of detonating themselves, they shoot while moving a bit slower than the regular Marine.

The Infested Marine is summoned directly by the Infestor, a Zerg ground unit.

Infestor


The Infestor is a spellcaster that can move while burrowed. It can mind control even probes, SCVs and drones, it can do Fungal growth which damage multiple enemy units and can spawn infested marines.

Larva
The Larva reappears in StarCraft II. It is protected by light armor.

It can produce a large variety of units: Drone, Overlord, Zergling, Roach, Hydralisk, Nydus Worm, Infestor, Mutalisk, Corrupter, and Ultralisk.

Mutalisk
The Mutalisk made an appearance in the WWI gameplay demonstration and have been confirmed as playable units. Its attack can still strike multiple targets, bouncing to strike up to two additional targets as it did in the original StarCraft games.

It is protected by light armor.

Nydus Worm
Can be used to transport small units such as Zerglings underground.

The Nydus Worm is a StarCraft II Zerg transport unit used to transport large numbers of small units, such as up to fifteen Zerglings.

It can transform itself into a Nydus Canal, at which point units can enter it and "accessed" from any Nydus Warren or other canal. After being loaded with units, it can also transform back into a Nydus Worm for transport.

The Nydus Worm works like a Ghost nuke; the player places a beacon, and a few seconds later the Nydus Worm pops up.

The Nydus Worm is treated as an armored unit.

Overlord
The Overlord has made an appearance in StarCraft II. It functions in a manner similar to its StarCraft I predecessor (a flying Control-producing unit).

Overseer
The Overseer is a Zerg unit evolved from the Overlord.

The mutation gives it the ability to detect cloaked and burrowed units, along with an increased sight range. However, it loses the Overlord's Creep and Slime abilities.

The Overseer's sight radius expands when it stays still and shrinks when it moves.

Queen
The Queen appears in StarCraft II, though is a vastly different unit from its predecessor, first notably now walking on the ground. It functions as a Brood Mother, with abilities such as restoring health to Zerg structures and injecting additional Larva into Hatcheries. You can train a Queen from a Hive, without using a larva. It costs about 150 minerals.

Roach
Has a fast regeneration rate, and is built from the Roach Warren.

The Roach is a very fast moving unit with 145 hp which recovers health quickly while burrowed. One-on-one, a Roach will generally win in a fight against its enemies, as it regenerates health faster than damage can be delivered when it burrows. As such, sustained damage is required to effectively kill it.

It is considered an armored unit.

Ultralisk


Strong Zerg ground unit. Can take on groups of enemies and will ram only enemy buildings. Has a health of 550 instead of 400.

Zergling
Zerglings have evolved, affecting such things as their appearance. They have small wings but cannot use them to fly.

They can morph into Banelings and burrow.

Scourge
The scourge is a suicide attacker that is only seen in the campaign. It is still powerful against air units and is not buildable.

Leviathan
A powerful zerg beast that is bigger than any Mothership and Battlecruiser. It has powerful tentacles for ground, powerful anti air weapons and can spawn various zerg units. It also has powerful abilities that can do serious damage. It is advised to attack it before it can move.

OmegaLisk
A super powerful version of the Ultralisk. Only seen in the campaign and it can devastate any ground unit it attacks.

Brutalisk
Rarely seen and it can attack air and ground but it is often a bonus objective that the player must kill to earn research points.