The Meek Shall Inherit

This one somehow manages to be fun whilst not actually explaining itself in the slightest. The aliens are doing something, but we don't really know what. They're after something, but they're at pains not to tell us what it is, presumably so the writers don't have to bother to think it up; and there's lots of running about for pretty much no reason whatsoever. I didn't get bored at all though, as I did in some of the other uneventful episodes. Pointless, then, but reasonably engagingly so.

( 'It's not the cold. It's something else.' )