The last episode is entitled dooms day and although we ent heard anything about them for a while it looks like the cybermen will be back bbc were quoted as saying "the return of old faces" a while ago which suggests the face of bo will tell the doctor that secret he had from episode 1, The interview i saw with billie on tv did seem to suggest she was gonna die she did the "nothings impossible in sci fi no matter wat happens" speach and i think that happened after they asked if she was gonna die so it does kind of indicate shes gonna bite the bullet , it seems there gonna give her one of those save the world buffy style deaths though
Wasn't Pete Tyler listed as being in the finale? Wonder if that my have something to do with her leaving?
The Doctor killed him with the Master's shrinking gun. It was at the end of the same serial that saw the departure of Turlough and the arrival of whiny bitch Peri. I want to say it was called "Planet of Fire", but I'm not sure that's right.