This story wears its influences on its sleeve, namely (as cited in the interviews) the Prisoner, A-Team and the Hartnell story 'The Chase'. It's not radical (it is a prison break and Dalek story after all) but as a series pilot it's an effective one- this Doctor is a much more hardcore, harsh one actively on the run, reluctantly drawn to help. It's fast paced (even by NuWho standards), but great fun.