The Doctor and Rose discover that the Doctor's oldest and most deadly enemy is about to break free, after being held captive beneath the salt plains of Utah. With Michelle Ryan. David's video ...

Doctor Who's lore runs deep over the 60 years that the show has been on air, but there are several episodes that define the show in important ways.

It has long been reported that Robert Shearman's episode of Doctor Who season 1, Dalek, could have been radically different, due to a rights issue surrounding the use of the Daleks themselves.