THE UNDERWATER MENACE
For the first three episodes I was considering giving this a five or six, but the final episode was actually very good, and it's a shame it's missing. Zaroff's motives - to destroy the world as a scientific achievement - is a bit weird, although it obviously ties into the character. Does raise the big question about what happens to everyone at the end. Not only does everyone fail to depressurise after coming to the surface (which the tardis crew sort of did in the first episode) but apparently it's set sometime in the seventies and all of a sudden hundreds of people who claim to be from Atlantis suddenly appear! The whole Atlantis thing I felt was a little silly, but that's me.
I guess I'll go back and tally the votes again...