Seriously, I cannot stress enough, this is a MAJOR SPOILER for the upcoming episode "The Lost Tribe".
Seriously. I read this article and watched the spoiler clip, and it has ruined the episode for me.
Watch it only if you seriously can't wait for the next episode.
This will reveal the identity of the mysterious aliens that kidnapped Jackson and McKay... and boy, you aren't gonna believe who they are.
(btw I'm having a competition to see how many times I can use the word "seriously" in one post. 4, before it becomes ridiculous!)