From the introduction:
Doom: The Next Chapter (DTNC) is a role-playing, tabletop game designed to be used with paper and pencil, instead of computers. DTNC is based upon the classic computer games Doom and Doom2. You have the familiar weapons, items and monsters you see in the computer game and much more.
While DTNC is based on the games Doom and Doom2, this is not just a tabletop version of Doom. I have created a unique history for the game that includes the period before the games of Doom as well as the aftermath depicted in the computer games. I have included a detailed description of the government, culture and economy of UAC. I have defined the conflict that rages between humanity and the minions of Hell
DTNC is, at its core, a role-playing game. The player will create a character with a background and unique attributes and skills. DTNC uses an original skill based system with no class restrictions. Even though the player character may have a background as a bureaucrat, this does not restrict the character in any way.
Of course, combat will play a major role in DTNC and I have developed a combat system that closely mimics the combat in the original games. However, I have extended this facet of the game as well and have introduced the concept of PSI. PSI is the ability to use mind powers for both offensive and defensive purposes. PSI uses Chi energy, a latent psychic energy.
The main conflict of Man against Hell can be supplemented with many subplots that provide the players with more than just a run and shoot. DTNC offers the players the chance to create and play a novel of the imagination, populated with good and evil. With the scope of DTNC, the only limit to the adventures is one of imagination.