'There's always you' (crossover fic)

I'll attempt to speak broadly here so as not to give the whole game away, but I felt I should at least comment on my own current work to explain my reasoning for the multi-crossover fic.

Bioshock is widely regarded the 'spiritual successor' to the System Shock series, despite one being set in deep space and the other under the Atlantic Ocean in the city of Rapture.  It's the same developers and author, has very similar game mechanics, and the theme of the individual versus the many is key to both, though Bioshock goes a bit less metaphysical and more Ayn Rand.

During Bioshock: Infinite, we were privy to various links and Easter Eggs pointing to Bioshock and the city of Rapture but never as far a field as System Shock, or the Von Braun (ship's name in SS2), or well anything.  So I began pondering, due to the 'constants and variables' of the 'shock' universes, and Elizabeth's ability to seemingly cross realities at will, why shouldn't System Shock be directly linked to the Bioshock world?  To do so requires some thought on not only how they are connected, but why.  I try to get to the nub of this quite quickly in the work, so I can concentrate on the 'scooby gang' trying to resolve it.

For this point, I will say SPOILERS AHEAD in case anyone is reading 'There's always you' and doesn't want it laid out this flatly.

From what we know of Bioshock Infinite there are an infinite number of realities running an infinite number of variables, creating the difference between the realities.  It may be something simple like the colour of a set of curtains, it may be that a person is male in one reality and female in another, it can be something more drastic such as in BSI, and so on.  In SS2, the protagonist defeats SHODAN and prevents her from transforming that reality into her digital 'construct'.  But what if in even one of the other realities, she is successful.  This would change the whole nature of the multi-verse, to have one consisting of a digital construct, and this in itself changes the nature of the universe and thus brings about the potential for portal technology, plasmids, vigors, time travel, and all the fantastical stuff that really shouldn't exist if not for SHODAN.  SHODAN's ultimate goal is to transform the entire multi-verse to her construct, ensuring her infinite existence.

SPOILER END

How does HL/Portal fit into all this, you might ask.  Artistic licence.  Ha!  Really, due to the dimension hopping that Gordon has already experienced, I thought well maybe it's all the same multi-verse so why not?  Same with Singularity, which I've only given passing reference so far.  I have been considering how far afield I should go (Cutter from Outcast dimension hops and wears orange...) but I reckon I've enough to contend with with the number of characters and scenarios to manage.