Well, I'm pretty sure that the Pfhor are the three-eyed Soviet space aliens of VALIS.
[1] This facsimile operated in part by synAC.Well, I've spoiled myself (wow that sounds wrong) with marathon.bungie.org, so yes. PKD references? Anything other than "Electric Sheep"? And what other references are there in general?
(Given the way VALIS works, Epileptic Trees are required. Infinity isn't much better.)
[1] This facsimile operated in part by synAC.Did you see the terminal in the last level of M 1 A 1 talking about the hidden cyborgs on the Marathon?
Nine cyborgs on Tau Ceti, one unaccounted for? You mean?
[1] This facsimile operated in part by synAC.Okay.
The cyborg enemies in M2 and Infinity are obviously your sheds. I mean, whenever you teleport, you leave behind a bit of an imprint of yourself. A mindless drone barely resembling you, but still in form. Tycho hacked into all of them and turned them into weapons.
[1] This facsimile operated in part by synAC.That's one I have yet to have heard.
I theorize that the Marine isn't jumping between realities/timelines in Infinity—he's using the Jjaro Junction thingy to calculate the likely results of different courses of action, and the One True Sequence is his actual course of physical action. In other words, you are playing through prophetic dreams.
Remember in Dune when Paul starts having numerous visions of possible futures, many of them bad? Similar thing.
(P.S.: Who would kick whose ass in a fight between the W'rk'nacter and Sovereign?)
Okay, the last few levels have been driving me to madness. Bobs are some of the most fucking annoying enemies in any FPS that I've ever played.
[1] This facsimile operated in part by synAC.I'm on "A converted church in Venice, Italy". So many switches! What the hell!
[1] This facsimile operated in part by synAC.I got through "One thousand thousand slimy things", I can get through this! I can! I only need to believe! D:
[1] This facsimile operated in part by synAC.The fucking lava chamber. Fight through the enemies then LOSE ALL YOUR HP then fight MORE enemies?! What the fuck
[1] This facsimile operated in part by synAC.

...Are the BO Bs running towards the Hulks?
I swear they are running towards the Hulks.
That's it. All unarmed BO Bs die by my hand for their own good. It is the only way to ensure the colony is repopulated by non-idiots.