Oswin is not the first or only Impossible Girl.
Clara Oswin Oswald. Speculation is running rampant all over the web about who she is. What she is. Oh, Mr. Moffat, you are a tricky one, are you? You created the impossible girl, Clara Oswald... but, she’s not the first one is she?
Clara, the 11th Doctor’s new companion, is the impossible girl. She’s the girl who has had the same face and the same name in two different lifetimes lived hundreds of years apart. Everyone wants to know what she is. How did she do that? The most popular theory is that she is actually Ramona, the Doctor’s Time Lord companion from the classic series. This theory states that we always assumed that she died on Gallifrey with all the other Time Lords when the Time War ended, and that we were wrong. Somehow she survived, either by chance or by simple happenstance of not being there. But, it isn’t her, is it?
Other theories suggest that she is Captain Jack Harkness’ daughter, conceived after the onset of his immortality, or that she is, Jenny, the Doctor’s daughter (from The Doctor’s Daughter). But no, this isn’t it either. She is neither immortal (not in Jack’s sense) nor a Time Lord. Nor is she the first of her kind.
I give you Gwen (Eve Myles) (see slideshow). She first appeared in Doctor Who (NuWho) as “Gwenith” in season one, episode three, “The Unquiet Dead”. She was the servant girl who worked for the undertaker in Cardiff. Yes, that Cardiff, the one on top of The Rift. She was the hero of the episode because, in the end, she died. She blew herself up to seal The Rift and send the invading gaseous enemy back where it came from.
This impossible girl appeared a second time in Torchwood, as show star “Gwen Cooper”. You know, the tough as nails Welch police woman who kept Captain Jack in line. That Gwen Cooper. And again she was involved with the Cardiff Rift.
The same girl, with the same face and the same name, during two different lives lived hundreds of years apart. Okay, only one hundred. But, it’s still the same scenario.
Of course, we could be wrong... but it’s still something for Whovians to think about. Tricky, tricky, Mr. Moffat. Tricky, tricky.