Doctor Who episode 477: The Invasion of Time – Part Four (25/2/1978)
‘Disappointing, aren’t they?’ Like The Invisible Enemy, this makes a joke of its rubbish “monsters”, although unlike The Invisible Enemy there are better monsters waiting until the end of the episode to make an appearance. I really like this: if the Vardans had just been rubbish it would feel a bit contemptuous to the audience, but it’s all part of the build to that rug-pulling climax and the return of the Sontarans.