-spoiler review warning --
This episode has to be my favorite of the whole series. It is very suspense filled, especially towards the end. It is one of the few that come from Rachels point of view, and gets you thinking about many things. It like the previous episode shows a bit more Rachel/Tobias, and really shows you how awfull it would be to lose your memory, and how even more awful it would be to be surrounded by controllers. It also, like most episodes has the great "lesson learned" summary at the end on how "our memories make us who we are."