Anything with Vashtra, Jenny, and Strax in it is automatically must-see TV. Clara was the awesome icing on the win-cake.

Although? For once I could believe that the sonic screwdriver was doing what it was supposed to be doing, although I wish he'd left out the anti-freeze line. He didn't melt the ice woman (and, randomly, I'm sure her repeated line is Deeply Meaningful Somehow), he blew her up -- something you can actually do with sound waves and ice. Sort of.