This episode really had the pearl conclusion for the storyline started at the end of last season. When the first part of this story ark was exciting, then this one was over it - first the new threat - replicators. Those little bugs manage to survive everything and I am almost sure one of them managed to survive the crash to the plane too, with Apophis (he just won't die)
All the things that happened turning this episode - in the end it looks like there was just too many of them... the motion never stopped, every minute was exciting. I really loved the episode.