Stalkers are humans.. Humans that had all their organs replaced with saline and are running on some life support thingy. They are basically human slaves for the combine.

The Combine take over planets by creating a hybrid of themselves, and the dominant race on a planet - they spread gas that prevents the inhabitants from reproducing, they put chemicals in the water to make them forget and fall to their rule. They enslave races with soldiers that can use the race's weapons, vehicles, and other technology.

This is how the combine get all kinds of technology - their last planet was Xen, which Gordon Freeman Freed (heh) in HL1, that is why Vortigaunts are now helping you (they were the smart ones on Xen) but headcrabs, antlions, fishy sharks, are kinda like some type of tigers, sharks, etc. on earth - they are wild and untamed, and now not under the rule of the combine anymore - that is why you see the combine fighting them. The big blob guy you saw was an actual Combine guy - because "Combine" soldiers and stuff are partially human.

We can assume most of their technology that they use came from other worlds they conquered, all they want to do is take all our stuff, the planet's resources, and turn humans into stalkers to work for them.


i think...

I've noticed that your airboat wieghs about as much as a feather. Seriously if you shoot it with your grav gun it will fly up and slowly tumble down. It might be a glitch too. Heres a screen. It stays that high for a couple seconds tumbling and then it falls ever so softly down. I found it funny.

Ok... Can't remember where I found this out, but I did. Stalkers are when the combine take a human for use as a soldier, but then find they don't want it as a soldier or something, so they make it a stalker. The combine soldiers are just same as stalkers but with some muscle and a bit more bulk. I'm not sure if they have full legs or not, you can't tell.