Nyssa laughed when Tegan told her. ‘It’s not complicated. Here’s an example. What’s the definition of an ancestor?’

Tegan thought for a minute. ‘Well, that’s simple. Your ancestor is anybody who is your father, your mother, your father’s father, your father’s mother, or your mother’s mother or...’ And as she spoke she seemed to see in her mind’s eye a long procession of Nyssa’s ancestors, a line now completely wiped out as a result of the Master’s last evil campaign.