You are a guard in the Combine Empire. You are searching for an anomaly, an experiment that went horrendously wrong.. the Stalker, He's a nearly invisible mutant hunchback creature with psychic powers. Peel your eyes near your shoulders. He can be anywhere, watching… and ready to kill, or devour you, kill it, before it kills you….or befriend it somehow. Your decision.

By the way, gore warning!