Zombie, Half-Life Wiki

A Zombie is a common enemy featured in the Half-Life series. It is the result of a Headcrab attaching to the head of a human and taking control over its victim's body, this incapacitates the host, and renders them a "Headcrab Zombie," or a "Necrotic", as they are referred to by the Combine Overwatch. Ordinary Zombies are often referred to as Standard Zombies to distinguish them from the other types of Zombies, such as the Gonome, the Fast Zombie, the Poison Zombie, the Zombine, and the Armored Z

Standard Zombie, Half-Life Wiki

Zombine - Combine OverWiki, the original Half-Life wiki and Portal wiki

Headcrab zombies - Half-Life Wiki - Neoseeker

Zombie, Half-Life Wiki

Electric Zombie, Half-Life Wiki

Snark - Combine OverWiki, the original Half-Life wiki and Portal wiki

Half-Life: Alyx / Nightmare Fuel - TV Tropes

Headcrab (zombie edition), HLEU (Half-life Extended Universe) Wiki

Headcrab Lifecycle that makes sense : r/HalfLife

Poison Headcrab - Combine OverWiki, the original Half-Life wiki and Portal wiki

Half-Life 2 E3 2004 Preshow Hands-On Impressions - GameSpot

Zombie, Half-Life Wiki

Zombies (Half-Life) Villains+BreezeWiki