Half-Life 2, Valve's 2004 first-person shooter, introduced the Stalker as a twisted, Combine-controlled enemy, and its scream became one of the game's most unnerving creature sounds. Players encounter Stalkers in dark, industrial areas where their jerky movements and distorted cries signal danger before combat begins. As clips from the game spread through soundboards, YouTube edits and Garry's Mod videos, the scream took on a second life outside the game. Editors still reach for it because it instantly reads as alien, painful and wrong, even without any Half-Life context.