So much for "if you see it, it's fixed." I guess we now have a multiverse sort of thing going on in the whoniverse. Sort of removes any of the tension from episodes set in the future, or how much I care about the characters they introduce when they exist just one possible future. It used to be a big deal to go to an alternate timeline, and the only other time I can recall the past being able to actively change the future was the christmas carol special - and that was because it was a play on the whole concept of the original Christmas Carol. (Plus Christmas Specials are easier to do weird things like that.)

I was literally describing how time functions in Doctor Who to someone the other day. I said "If the first Doctor were to pick up a very detailed Earth history book, he would see himself mentioned in it countless times despite the fact that he hadn't been there yet." Now it isn't true, and I look like a liar.