Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Doom (2016 video game)
In a 2016 video documentary by Noclip's Danny O'Dwyer, Creative Director of "Doom (2016)" Hugo Martin described the "Hell on Earth" premise as: "It was like Robert Zemeckis. See "Contact", like, if this really happened. Now let's be clear: it was awesome. But it was more realistic. It was about the global impact of a Hellish invasion." The creative director of the "Doom 4" prototype, Kevin Cloud, said in the same interview, "As far as the upper-level creative direction, that was me driving that. And honestly, again, taking it in a direction I don't think the fans would have enjoyed."