3. Dalek (Story 161, 2005)
http://www.youtube.com/watch?v=xd28yBi9tU0 Im not going to lie. Part of why Rose and Bad Wolf/The Parting of the Ways are on here is because of their importance to the great Doctor Who arc. Had they not been as big of a deal as they were, they wouldnt be on here. But Dalek, based on a Big Finish Sixth Doctor audio story named
Jubilee, earns its place of note. Its a tense, sometimes terrifying story that shows what a single Dalek could do. Its so powerful and effective that one really wonders how anyone has ever managed to fight back against them and win. Its also got one of the most amazing shots in the series of the show where we see the Dalek in the sunbeam. Plus the scene on Ecclestons face when the Dalek says, Doctor? THE Doctor? is so very incredible. The Daleks have never before, or, sadly, never again, been as well-utilized as they were here.