Half-Life Episode Two is a mod for Half-Life, here the first demo version.
Plot:
Half-Life Episode Two begins exactly where Half-Life ended, after accepting the job agreement with Gman, Gordon Freeman is sent back to the Black Mesa Research Facility, why? It's up to you to find out. Explore never seen before areas of Black mesa in seven chapters that will immerse you into a spooky and dark environment while you search for clues to reveal one of the darkest secrets of the facility and the reason why you were sent back in.
The Project:
Half-Life Episode Two is a horror/action single-player Half-Life 1 modification currently under development, the adventure features improved and redesigned game-play mechanics, lots of exploration and action, deep atmosphere well as a it's own unique plot set on the Half-Life Universe while partially staying true to the original Half-Life game-play.
Version 1.0
Moddb.com
I vividly remember following Half-Life Episode 2 but development must have paused a good 10 years ago D:
I don't remember that screenshot though, is this another mod or part of the demo?
Image from moddb profil but probably not present on the demo version.