Teivman

Is it me or is the intro part to doom 3 a lot like the start of half life 1?  

Half life - You arrive at work where everything is fine at first then this experiment fucks up then aliens arrive through portals and stuff like that.  

Doom 3 - You arrive at work where everything is fine at first then they open up a portal then shit happens then demons arrive through portals and stuff like that.