"The tone: There's nothing soft or watered-down about "Doom." In their own words, the makers of the film are going for a "Hard R." Excellent news for Doomers.

2. The set: Every set, every corridor, every weapon looks faithful to the game. The set is a maze of dark corridors, steel-dungeony-looking hallways that should be scary as hell. The arsenal of weapons includes several nods to the game, including, of course, the BFG.

3. The effects: Bartkowiak is using real models when possible, minimizing the employment of green screens. For instance, the monsters have real monster costumes--dark and creepy. The "Baron," in particular, looks like an "Aliens"-worthy creature. Much more on him later.

4. The story: The script is loosely based on the "Doom 3" videogame. Sometime in the future, John Grimm (Karl Oben), Sarge (The Rock), and a military -esque crew receive a distress call from a science lab on the remote planet Olduvai. (No, that's not a cologne.) They teleport to Olduvai. Once on Oldvuai, they're thrown into a maelstrom of dimly-lit hallways, monsters, and bloodshed. The setup might differ slightly from the game, but it's the same meat and potatoes.

5. The location: Don't worry. No part of "Doom" takes place in Prague. The sets are all indoors--as befits the brooding game--and have nothing to do with the Czech Republic."