Board Thread:The Panopticon/@comment-1293767-20151029072618/@comment-5918438-20160111045754

So that's the Churchill appearance, through to the credits, forms the last 4% of the episode as a whole, as aired. So let's call that tentatively 5%, and maybe we'll find out another example given doesn't make 5%. Or we could just extend it to 10% right away, just to be safe. I mean, anyone arriving after 38:54 in a 43 minute episode can't be a very big character in the story, even if truly a two-parter.

Even with the reveal of the "Human Dalek" in series 3, that character technically already appeared as a regular Dalek earlier on in the first episode.