It was first released on December 10, 1993, when a shareware copy was uploaded to an FTP server at the University of Wisconsin. The Ultimate Doom, an updated release of the original game featuring a fourth episode, was released in 1995 and sold at retail.

Where did Doom originate from?

The concept for Doom was originally created while id Software developers were playing Dungeons & Dragons with co-founder John Carmack, who now is the chief technical officer at the VR company Oculus. A developer failed a quest for a magic sword and accidentally caused the world to be overrun by demons.

What is the backstory of Doom?

Plot. Doom takes place during the year 2149 in a research facility on Mars owned by the Union Aerospace Corporation, run by Dr. Samuel Hayden, a UAC scientist and the head of the facility, whose mind now inhabits an android body after having lost his original to brain cancer.