Gets a 9 from me. Of course, it's a bit light on the moral issues and so on, but not every episode needs that, and after last episode, we could do with some fast paced episode relief.
And fast paced it was. There also was some kind of suspens, it even got me to sit on the edge of my seat ... (or rather grab the couch's material) ... acting was OK too. All in all, a nice episode IMO. I wouldn't want all of them to be like this, but one from time to time is all right. Or maybe I just wasn't in the mood to nitpick on the temporal paradoxes, which are of course legions (as always in time travel episodes).
;)
