HYPATIA: I can still hear the sound of it. The city being torn apart. I play over the events of that afternoon and it all comes back. The noise, the stench of the dead as we made our way down to the harbour. The creatures advanced into the town, tearing down buildings as they went. We fought a tide of people running from the destruction. More than once someone tried to stop us walking to our deaths. But the Doctor's face was set. His eyes glinted with steely resolve. He was an old man, white haired and walked with a stoop. And yet beside him I could overcome the terror pounding in my chest. Together, we went to meet the creatures.

HYPATIA: I've only read the first few scrolls. A critique of Aristarchus. Well, more a personal attack... why do people have to be so mean?

IAN: Aristarchus... he believes the Earth moves round the Sun, and not the other way round.

HYPATIA: Yes, it's silly, but there's no need to mention his mother.

SUSAN: It's like a farm for memes! Oh... I shouldn't have said that. Memes are from after your time...