XSGCOM.
One one hand you have SG-1 which has its moments of drama, but is rather light for the most part and has a few lovely cultural scenes here and there in the beginning <> On the other hand you have X-COM a series that would seriously dip into the grimdark if you play it with a high enough difficulty and which only isn't because your squaddies will end up badasses that chew Chryssalids in close quarter for breakfast and will knock a Muton out with their
MEC-enhanced fist.
Now you mix them both together and suddenly you have both organisations working with one another, without either one getting wanked over the other and both the X-COMs "kill it first, loot everything that isn't bolted down and then come back to copy the way the bolts were done" as well as the SG teams more exploratory nature being depicted next to one another with their strengths and weaknesses. In any way: lots of Death Jaffa, some familiar Big Bads and a quite amusing pairing to say the least~
...ohh and Colonel O'neill has to deal with a Russian on his SG-Team - hilarity ensures. A good read that is widely appreciated (even if I would say it has a tiny X-Com bias and loves to blow things up - but which audience wouldn't like that around here?). Staffweapon Plasma Gatling gun - Do I need to say more?
Hm.. well, first of all, when are we in this timeline?
Depends on the GM - with the problem being that you could be anywhere from right in the middle of the SG-1 series to past its last episode actually (2000-2013 depending on where you start). But I think its actually quite unlikely that Gideon will just import the SG universe like that (and hard to work with as it restricts you a little).
Do we have OOC knowledge of this place?
If any of you have seen the series and if Gideon isn't changing the universe too much - why not?
What Aliens would we benefit most from allying?
Hard to say right now - downright allying depends on how the SG Teams of this world have presented themselves to others and how you are going to do it. There are hundreds of human cultures that might be open to you, then there are the Jaffa (gen-engineered humans that carry the Goa'uld larvae in a stomach pocket to allow them to mature and live two centuries, but without a larvae they have no immune system and die) where some are trying to overthrow their false gods. Then there are the Tok'ra - the same species as the Goa'uld but different philosophy, who only take willing hosts and try to break the Goa'ulds reign over the milky way.
Then there are also the Asgard (Greys) who live in a nearby galaxy and are protecting some planets through the milky way and have the name of the Norse Gods. Mhh....you would actually benefit more from getting into good relations with some sort of slightly advanced human society, because you would be in a better trading position and could replicate their technology, or some Goa'uld based technology as it is idiot proof, can run for centuries and their basic weapons might be terribly ineffective - but they do shoot Plasma. There's the Lucian Alliance, a trader/Cartel network that also uses Goa'uld technology and ships~
Could we hijack the Stargate?
Depending on where it is right now you would have little luck if its in the Cheyenne Mountain Base - but there is another one in Antarctica in the series, one that even has the device with which you can dial other planets. The only problem would be that you would be lacking addresses and the SG Centre would notice that your Gate is blocking theirs if you don't infiltrate them enough.