Another week, another fairly average episode of Doctor Who...at least, in terms of plot.

The story shows up, ticks the boxes it needs to tick, and keeps out of the way. The Krillitane plot doesn't make a whole lot of sense, but does anybody care?

And then there's the big guest star of the episode - it's Anthony Stewart Head! As a longtime BTVS fan, it was fun to see him, but he's not exactly used to his full potential here. That said, he plays the uptight Krillitane headmaster pretty well.

And that's it! See you next week!

Okay, obviously the main event is Sarah Jane showing up (with K9 in tow). Even as a non-fan, I had an awareness of Sarah Jane and her prominence in the show's history, and the show does a good job exploring the conflicted emotions of both her and the Doctor once the reunion happens. I'm sure there are loads of opinions on her pissing match with Rose, but it ends in the only way it really could - with them uniting in mockery of the Doctor. Elisabeth Sladen has a great presence.

I've never seen The Sarah Jane Adventures, so I don't know whether this was intended to set up that show in a meaningful way - from what little I know of the series, I suspect not.