- Kane: You can't build an ionic membrane from scratch.
- The Doctor: If I had crayons and half a can of Spam, I could build YOU from scratch.
- The Doctor: In societies that let this happen, there's nearly always a ruling elite that gets to evacuate, and then signs off all responsibility for whatever they've left behind.
- Yasmin Khan: That's messed up.
- The Doctor: Happens more than you think.
- The Doctor: Don't want to talk to me? Fine. I don't need a second person for a conversation. A lot of the time they just get in the way.
- Bella: You've got a plan, right?
- The Doctor: Oh, it's brewing. At least three-eighths of a plan right here. Two-eighths. I'll be honest, all I've got is the letter P, but sometimes that's all I need.