I think Martha, and Freema Agyeman, both deserved a lot better than the series ever gave them. Martha is about the only Davies era companion (in fact, virtually the only new Who companion) I actually like.

I thought I was well-read, but I assumed fifty-seven was a number picked out of thin air, or possibly a Heinz reference (I did get the rest of the joke).

This was about the only episode in the first half of the third season that I thought was any good, although fortunately things would improve in the second half.