Turn Left -
Wow. A simple premise, done very well indeed. A deep and surprisingly sinister episode. And my, hasn't Billie Piper matured? (Not too much thank Christ, because she's the same age as me!)
And as for that trailer at the end... kitchen sink incoming! Still, should be fun! Although I have a feeling I will be disappointed if a certain Mr. Molloy isn't in it...
UPDATE: I seem to be a little disappointed, then. Still, it will be great anyway!
Watch only if you want to be slightly spoiled - unless you've already seen the cover of the Radio Times, in which case, call it a teaser!