A single player campaign. You must fight your way to the surface of Black Mesa...
Know your enemies
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Description
the new alien race introduced since Residual Point, looking like zombie HECU, with a much higher fire rate, and much more resistant. Their true allegiance is unknown, as they seems to be friendly towards Xen creatures but hostile to humans (scientists, HECU, black ops)
Hybrid Zombified HECU Marines.
That looks so badass