[ fun fact Joker: the rules about 'fixed points in time' or whatever in Doctor Who are full of bullshit inconsistencies. Thankfully, this is one bullshit inconsistency that the Doctor's fine with. He can't help but smile a little, traces of the smile playing on his face as he continues. ]

Again, it all depends. But with something like that? A mass extinction event...you could definitely sneak a few people out. And I'm speaking from experience.