Slightly misunderstood the thread title and was just about to bang on about Pertwee's first episode, CE's first episode and DT's The Christmas Invasion then it dawned on me, the
FIRST Doctor epsiodes and not the first episodes of new Doctors.
What a schmuck.

Dalek Invasion Of Earth for me is not only the best WH story but amongst the best Who stories, no sod it, it's up there as one of the greatest sci-fi stories of all time for me. It does what the greatest, and I mean the greatest (count on under 10 fingers stuff) Who stories do, they stand alone as a piece of drama in their own right regardless of it being Doctor Who or not. I think it is a wonderful piece of TV drama that uses all of the classic British sci-fi quirks and metaphors, dystopia, Big Brother, invasion and so on. Of all of the classic Who, this is the one that I go back to time and time again.
The Time Meddler is charming.
But to be honest I really do struggle with the rest of them, they have their wonderful moments, they are for the most part charming, witty and brilliantly sci-fi for early 60's TV (far more daring than Star Trek ever was) but as I said I do personally struggle with them.
But thank god they came along though eh?