Half-Life on the engine, not Doom tells the original story, and his.
In the network one user with the nickname Bolloxed created a modification for the cult game Doom, which, using his slider, alters in no less iconic Half-Life.
The corresponding video he posted on YouTube.
Mod he called Paranoid. However, he does not follow the plot of the original, and tells his story.
As you know, Doom, and Half-Life, shooters are a cult that influenced the genre and game development in General.