After the Doctor's latest regeneration Rose is not sure about the new man in the TARDIS, and the new Doctor tries to convice her that he is still the same Doctor but just looks different.
The Doctor starts to behave very erratically and begins to exhale remnants of the Time Vortex. The Doctor sets the TARDIS on course for Christmas Eve in London, Earth to take her home. As the TARDIS heads on a collision course for Earth the cloister benn begins to toll...