Quantum events experienced in the Half-Life universe|''Half-Life'' and ''Portal'' universe.
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CategoryHalf-Life Wiki{{Article|Image}}
{{Information
|attention=
|description=Early ''Episode One'' screenshot.
|source=''Half-Life 2 Episode One'' / http//www.1up.com/do/slideshow?pager.offset=0&mt=0&cId=3139501&mId=2257186 1UP.com
|author=
|filespecs=
|licensing={{Gamescreenshot}}
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|cat artist=
|cat subject=CategoryCity 17 imagesCategoryOverwatch Soldier imagesCategoryAlyx Vance imagesCategoryAlyx's Gun imagesCategoryCombine SPAS-12 imagesCategoryArmored Personnel Carrier images
|cat type=CategoryHalf-Life 2 Episode One screenshots
}}