Doom 3 alpha version

History
A work-in-progress version of Doom 3, called the "E3 Demo Alpha" (also known as the "Alpha version"), was placed onto the Internet in late 2002. As with most video games, this work-in-progress version differentiated from the retail version in several aspects. These differences include, but are not limited to, the following:


 * Graphics for the Heads-Up Display (HUD)


 * Models for the weapons & enemies


 * Sound effects for the atmosphere, enemies & weapons

Furthermore, the map level used in the "Alpha version" was not included in the retail version of the game. The likely reason for the level's exclusion from the retail version was that the level was built for demonstration purposes only & was never intended to be included in the retail version.

Plot
It all begins on the Mars Research Facility. A Scientist walks between a couple of guards. He goes to the Communications Room and says that the Stabilization Field has a Problem. another Scientist says:Theres nothing too worry about. Moments later, the base shakes. The Delta Teleporter fails and opens a gateway to Hell. Many Ghost-like Skulls come from the gateway. Two Ghost-like Skulls transform a Mars-Sec, His Skin begins to turn green and his Eyeballs explode. they mutate into two Z-sec and go around the base. There is shown an Imp watching a Corridor, an image of a Man trapped, and a type of Pentagram appears. After that the marine comes from an Elevator. He goes around the area killing the transformed personnel. Moments later, A Hellknight appears. The marine hides and the Hell Knight doesnt notice him. the marine goes to the Upper levels and is attacked by a Pinky. After shooting it down, he spots some more powerful transformed guards/marines called Commandos. He kills many of them and goes Upstairs to the Alpha Labs. Seeing the corpse of a Janitor, he goes to a service ??? and sees Pinky eating another Janitor. He kills the Pinky and the still "alive" janitor. He then is attacked by many Imps. when About to leave the Alpha Labs he realises that the exit is blocked. The marine turns around and a Hell Knight is behind him. The Hellknight crushes the marine, he rips off his head and eats it.

Links
Collection of screenshots

A gameplay video of the E3 Demo Alpha (With added background song)