Number 49:
Survival (1989)

A quiet day in Perivale. You can see why Ace was so desperate to escape from the drudgery of suburbia we see here. I remember days like this from when I was a teenager in the 80s- nothing to do, nowhere to do nothing. It's very accurately portrayed. I like the way that even the Doctor is bored of it after a few minutes, until he finds a mystery to sort out!

Sophie is great in this episode. She's the centre of it all- it's her friends that are missing and I like the way she's embarrassed by the Doctor once she's back on her own territory. Her silent, mouthed "Wow!" when first seeing a Cheetah person is also very good. Love the whole playground sequence in fact- nicely directed by Alan Waring.

Oh and isn't the Master watching young boys at play and then " No sport for you here" rather sinister?

Right then, time for the last one... and it's also the first...