Since I'm a big Stargate fan, I'll definitely be reading this one!
Door sized pane of light, hmm? Sounds like a Goa'uld cloaked ship of some kind (a tel'tac, maybe?). And this guy doesn't sound like a Goa'uld to me, more like a Tok'ra, with how he's asking permission before taking this soldier as a host. He's going to have been on the planet for awhile, too, when Lois and Clark come into it.
Personally, I hope this won't be during the whole Orii mess (didn't like that story arc) and without Jonas (can you say Mary Sue? lol). I'll read it if it is, of course, but I think it'll be better if it isn't.
I can't wait to see where you'll take this.
Tara