Just when I was starting to lose hope in Doctor Who and call series 4 a failure, they give us the story from the writer that has given us the best in the past series of New Who.This definitely has the potential for 10/10 but it has unfortunately confused me a bit so I'm giving it a 9/10. I know I saw Donna on the TARDIS when The Doctor sent her there via teleport, then she sorta screams and vanishes so that's a little confusing.