This episode was Billie's last regular appearance as Rose Tyler on Doctor Who. She and the Doctor are now in parallel universes (nothing that a little script writing could not fix!). A great shame worthy of a little commemoration. One of the better companions imo. Also in the pics, David Tennant / The Doctor, Noel Clarke / Mickey Smith, Raji James / Dr Rajesh Singh and Shaun Dingwall / Pete Tyler.