This Year's Model of Humanity

Actually, come to think of it, the whole Bad Wolf thing with Rose was almost exactly like The Curse of Fenric in which we have a companion (both Ace and Rose) who is terribly important to the plot of the episode/serial and we find out things about them that extend--retroactively--to their very first episode on the show. And there's the whole wolf thing, what with Ace being a Wolf of Fenric. Of course Ace didn't look into the heart of the TARDIS, but Ace beats up Daleks with baseball bats, so.