Each episode has a pre-credits sequence, and a trailer for the following
episode at the end. Episode one has no pre-credits sequence, and episode
thirteen has no trailer.
Credit at the end of "The Parting of the Ways": "Doctor Who will return in
The Christmas Invasion".
During the first season, Christopher Eccleston is credited as "Doctor
Who" however this is not the character's name. Beginning with the second
season - reportedly at the behest of the show's new star, 'David Tennant
(I)' - the credit has been corrected to read "The Doctor".