Zombie (Doom 3) - The Doom Wiki at

The basic Doom 3 zombie is a reinterpretation of the classic former human. They were once UAC civilian employees, now possessed by evil spirits. A scripted event early in the game shows scientist Jonathan Ishii coming into contact with a transparent "ghost skull," which turns him into a zombie. The demonic force that creates zombies does not differentiate between the living and the dead, as slain humans will be also be re-animated as zombies and do not seem to be any less powerful than the ones created through possession of a living host.

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