Theory

[tasty_kate]

The Doctor already know who Clara is, he just refuses to believe it because it's so impossible.

Comments

[nostalgia_lj]

OOoh, I like.

[tasty_kate]

Damnit, I was so wrong. hahaha

[stick_poker]

I've been wondering for a while now if he's known but has forgotten, in the way we've seen Clara herself learn things and forget them.

[tasty_kate]

[THINLY VEILED SPOILER FOR TNOTD AHEAD]

Okay, maybe this now works 'cause of the last episode?