Zombies are recurring antagonists in the Biohazard (Resident Evil) series, serving as the primary threat encountered by players. Created by the T-virus, these undead creatures are former humans turned into mindless monsters driven by an insatiable hunger for flesh. Zombies play a crucial role in establishing the horror atmosphere and challenge within the series, representing the catastrophic consequences of bioweapon research gone wrong. Their presence is iconic and central to the series’ narrative and gameplay.