Oh, I would definitely introduce other worlds via Spelljammer/Planescape. But I thought how a high-tech "Earth" society might find a portal to a "desert world" and then looked that my gaming shelf... 4e Eberron and 4e Dark Sun. And I went 'derrrp'.
Now, the MOVIE 'Stargate' works well with the two worlds. The SG-1 Series would work better with Spelljammer... and Atlantis might work very well with SJ AND Planescape.
For me, SG:Atlantis was the best D&D campaign ever.
The difficulty I see with such a themed game is the 'fantasy' aspect. I have found that my players have a very difficult time 'buying in' to the settings as they are not familiar with the subject material. They've also been playing a lot of Serenity RPG lately; everyone his human and they have a lot of 'modern' tropes to feed off and build from.
Problem is, once a fantasy world is introduced, they have few frames of reference and the game sort of devolves into your traditional dungeon crawl. It works for 4e but doesn't give me the feel I'm looking for.
Yes, I could easily switch to Pathfinder, and I'm not against that, though only two of the players have tried it before.
Anyway, this is kinda unfocused, but bottom line, I've always wanted to run a Fantasy 'Stargate' themed kind of game and am curious of ways I could make it happen.
Also, d20 Modern has crossed my mind.
Also also, Yuan-Ti suddenly become quite sinister.
