The top 10?
1) Caves of Androzani - Yes, it really is that good. Peter Davison's final story as the Doctor is both thrilling and fascinating, thanks to a complex plot, intense performances and beautifully staged action. The Doctor is dying from the first moments of the story, and this is all about him making his final hours count.
2) Blink - You could argue that it deserves the top spot. This insanely inventive story about stone statues that can get you when you're not looking, and a DVD extra showing a missing time traveler dispensing cryptic advice, is still unrivaled, even after years of copies.
3) City of Death - Douglas Adams co-wrote this witty story about an alien fractured in time, who is creating duplicate Mona Lisas as part of a ploy to time-travel and erase humanity from history. The most stylish classic Who, but also the cleverest.
4) The Doctor's Wife - The TARDIS is made flesh, and we finally get to the bottom of the Doctor's relationship with his time machine, in this intensely moving story.
5) Midnight - When the Doctor's gift for being the "cleverest man in the room" is turned against him, he's at the mercy of human nature at its most revolting, in this misanthropic, scary story.
6) Vincent and the Doctor - Of all the "meeting famous people" stories, this is the most heart-breaking. An astonishing look at art and madness and what being able to see things that nobody else can see might do to someone.
7) Pyramids of Mars - justly revered, this story about mummies and pyramids is a great example of Tom Baker's Doctor coming up with three or four plans to defeat an ultimate menace... all of which fail. Sutekh is a fantastic villain, and it's great that we've never seen him since.
8) The Ark in Space - Years before Ridley Scott's alien, a wasp creature laid its eggs inside cryo-preserved humans. The Doctor is at his wits' end coming up with plans to defeat the Wirrn.
9) The Genesis of the Daleks - The Daleks' origins as space Nazis are fully displayed here, and the ethical debates in this story are absolutely mind-boggling. Davros is a master manipulator who gives a human face to the Daleks, in his one really great outing.
10) Turn Left - a fantastic alternate-universe story where one little change wrecks everything, and we see just how bleak things could really get.