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

Half-Life 2 - Wikipedia

Zombie image - Provenance mod for Half-Life 2: Episode Two - Mod DB

Sweet Half-Life, Half-Life Wiki

Is the host really still alive? I've heard two sides of the argument so is there any official confirmation or evidence, other then the reversed screams, that the host is kept alive

Zombie, Half-Life Wiki

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

Zombine, Half-Life 2 Cut Npc's Wiki

Zombie - Wikipedia

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

Standard Zombie, Half-Life Wiki

npc_fastzombie - Valve Developer Community

Headcrab Lifecycle : r/HalfLife

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

Combine Hazmat Worker - Combine OverWiki, the original Half-Life wiki and Portal wiki

Half-Life: Alyx / Nightmare Fuel - TV Tropes