Another great episode and the first part of two-parter. Now I can really feel that the story might end after all. If the humans will find a way to explain the wraith that turning on that device was a misunderstanding, then the life-sucking might be healed and one of the main problems would be resolved.
So a new race in StarGate Atlantis? Well... as it turns out - it's NOT. They are the long lost former friends of SG-1. Yes! The Asgard! This is not just my theory - I found a clip where an Asgard comes out of that suit. An unexpected turn of events isn't it?
Also the ending of the episode could have been better because we have already seen a similar explosion in season 3. The best anding would have been the clip I saw - with the Asgard.