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| General information
| Game information
| Entity / spawn codes
- monster_zombie (HL1)
- monster_zombie_soldier (Op4)
- monster_zombie_soldier_dead (Op4)
- monster_zombie_barney (Op4)
- npc_zombie (HL2 standard)
- npc_zombie_torso (HL2 torso)
- "Ugh... that smell can only mean zombies."
- ―Alyx Vance
The Zombie is a common enemy featured in the Half-Life series. It is created when a Headcrab attaches to the head of a suitable host and takes control over its victim's body, rendering the host a "Headcrab zombie" (or "necrotic", as they are referred to by the Combine Overwatch).
Ordinary Zombies are referred to as Classic Zombie to distinguish them from the other types of Zombies, such as the Gonome, the Fast Zombie, the Poison Zombie and the Zombine.
As their name suggests, zombies do not appear to retain much of their former intelligence and, like Headcrabs, will blindly pursue their prey, oblivious to danger (such as the propeller traps seen in Ravenholm). Zombies do not respond to fire and will walk blindly into it, though they feel it on them and notice they are burning once they are on fire. Zombies mainly attack with swipes from their claws, but in Half-Life 2, they gain the ability to forcefully punt objects towards the player. Also in Half-Life 2, certain Zombies can be found "sleeping" and stand up to attack the player if they get too close or are attacked.
As Headcrabs do not attach themselves to native Xen creatures, Zombies are only found on Earth, usually in remote or deserted areas.
Zombification is also one of the ways used by the Combine to subject and intimidate the human race. Headcrab Shells will often be sent to Resistance camps to dismantle them, turning the Rebels stationed there into Zombies with the use of Headcrabs. This is notable for the Rebel stations along the City 17 Canals (in and beyond the Underground Railroad) or Ravenholm.
A Headcrab's attack does little damage (with the exception of Poison Headcrabs), and it also takes some time for Headcrabs to take over their hosts, who are initially still in control; however, Headcrabs both attack very swiftly and (should they succeed) latch onto the head very firmly, so that any attempt by a struggling victim to remove the parasite with their hands is largely futile. Coupled with disorientation and the imminent loss of consciousness from suffocation, this ensures that most victims nonetheless succumb very quickly, explaining the exceptional effectiveness of the Headcrabs' use by the Combine.
It is not known for sure if a victim of a Headcrab attack can still be rescued once a Headcrab has attached itself onto their head. Gordon Freeman's sole attempt to do this at the infested Station 6 apparently failed, killing both the Headcrab and its victim.
- An unusual characteristic of the Poison and Fast Zombie variants is that only three middle fingers of the five on each zombie's hands develop into claws, compared to all the fingers on a Classic Zombie.
- An often-overlooked effect that signals a Zombie's presence is the buzz of flies due to the rotting flesh and bodies that can often be found around them.
- On Station 6, a Classic Headcrab can be seen latching onto a rebel's head, turning him into a Zombie.
The Classic Zombie HECU grunt.
The Classic Zombie multiplayer model.
The Classic Zombie security guard.
The Dreamcast version of Classic Zombie.
The PlayStation 2 version of Classic Zombie.
The Half-Life 2 Classic Zombie.
 List of appearances
Combine OverWiki has more images related to Zombie