Редактирование: Half-Life universe (раздел)

==== Stalkers ====

<blockquote>"This is what happens to you if you resist...or if you're just in the wrong place at the wrong time." ― Alyx Vance on stalkers in <i>Half Life 2: Episode 1</i></blockquote>

Some less fortunate humans are enslaved and turned into 'stalkers,' stripped of their extremities, identifying characteristics, and 'unnecessary' organs.  Stalkers are not depicted as capable of speech, and walk and work using crude prosthetics - with reminders that their "limb privileges" can be revoked.

While they are not shown outside the Combine Citadel, chatter among resistance fighters in-game show they are aware of stalkers and their risk of becoming one for their actions.