An alien parasite-type creature which bites itself into its target's head and gains control over it. That results in all sorts of zombies. Luckily you, the player, only receives some damage instead.
Related control variables ('CVars'):
- sk_headcrab_health# (Default: 20, 30, 20)
- Skill CVar for headcrab health.
- sk_headcrab_dmg_bite# (Default: 10, 15, 30)
- Skill CVar for headcrab jump-attack damage.