4.13 - Journey's End

From IMDB:
The Doctor and his companions prepare to do battle with Davros and the Daleks who are out to destroy everything and everyone in the universe other than themselves. All seems lost when the Daleks apparently destroy the TARDIS but it's not that simple as an empowered Donna - and a new version of the Doctor - take control and face the Dalek menace head on. For one of the Doctor's companions however, there will be a heavy price to pay.

115 out of 122 (94.3%) raters say this story requires a previous story.