Risa

O'Neill (two Ls) absolutely would not be just sitting in a bar playing darts. He'd be poking around where he should be, telling Daniel to ask his annoyingly humanitarian questions to make sure DS9 isn't some weird hidden prison camp (anymore) and probably trying to step in to help assist against the dominion. If it's Mitchell, above still applies but he'd also be participating. I assume it would have to be Mitchell if the Atlantis team is able to appear, but hey it's time travel baby! Rules go byebye. Sha're and Drey'ac could show up too.

Daniel is always translating for the group, and we only get to hear other languages spoken when Daniel has trouble translating. It's their version of handwaving why everyone speaks English instead of handwaving as a universal translator (that wouldn't work if you aren't on a ship or don't have a comm badge or are on a planet where no tech works, but everyone still understands each other anyway)

And Carter would be having so much fun trying to figure out how all the tech works, I think she would demand to see the chief engineer and science officer. Things could get weird if she's read the Atlantis mission files yet.

And if it's the Atlantis team showing up, they're probably going to assume someone figured out Laiden's plans, saved Cowen, and now they're plotting revenge on a repurposed mining station from a long dead civilization.

Man there are so many actors that have been in both franchises, it's hard to pick which would be the most interesting in-character interaction to see.

Jellico/O'Neill would be hilarious. The Nox could sure teach quark a thing or two. I'd love to see Q come face to face with Simmons. Teyla rounding a corner and running into Tucker would certainly be a fight worth watching.

I wonder, would Teal'c even recognize Ishta as tpol?