First part is really good, we've never seen the Doctor's mistakes in flying the TARDIS end up with this much of a painful result for the companion's family before. I like the premise of the episode, the action and intrigue is there. It works well as a two-parter, and allows there to be more reveals than what we would normally get. The fat and fart jokes are a bit naff but I found them funny when I was younger so I guess the purpose there was to appeal to children, since Doctor Who is meant to be a family show: adults get the innuendos that kids don't understand yet and kids get the toilet humour that the adults find lame. Also never noticed Toshiko until now, mainly because I hadn't seen Torchwood until this year.