The Area 51 "Prototype Intro" is the prototype of the intro showed in one of the Playstation 2 Official Magazine demos. The intro is heavily edited.
- The escape hatch shows the blood for longer.
- HazMat Delta spots the mutant it does not jump out at them at the full version intro, instead they see a "Theta" not a Leaper. And they see the Theta roaring, not like the Leaper which jumps from the mist and HazMat delta fires randomly.
- HazMat Bravo just lands- The reback (A flashback only that its the future) of Ethans does not show, it would reveal too much and would seem like you have the game.
- The team suits up: This happens in game, but the bit did show in the voice interview in the game.