In late 1995, Doom was installed on more computers than Windows 95, and Bill Gates put himself inside the game to promote Microsoft's operating system. This episode goes back to id Software's Suite 666 office in 1992, where Tom Hall's story-heavy Doom Bible collided with John Carmack and John Romero's demand for pure action, a clash that ended with Hall fired in July 1993 and Sandy Petersen brought in ten weeks before launch to finish the levels.

The conversation digs into the technical illusions that made the game possible: 2.5D map data, binary space partitioning that only drew what the player could see, palette-darkened lighting, billboarded sprites made from photographed clay and latex models, Toys R Us gun parts, and Kevin Cloud's real arm on screen. It then follows Bobby Prince's split heavy-metal and ambient soundtrack, Jay Wilbur's  ...