DR. BRENNAN: But…it’s bigger… on the inside. That is physically impossible. I would know. I am a scientist.
THE DOCTOR: Yup. Yeah, it’s physically impossible to create on your planet.
DR. BRENNAN: What does that mean?
THE DOCTOR: What do you think it means? You say that something being bigger on the inside is physically impossible, but here you see it with your own two eyes.
DR. BRENNAN: So you mean to say… you’re not from Earth?
THE DOCTOR: Yes.
DR. BRENNAN: …Okay. And is this your…
THE DOCTOR: Spaceship, yeah. Did I mention it also travels in time?
DR. BRENNAN: Time travel is physically impossible.
THE DOCTOR: Again, you’re limiting yourself to the knowledge of your planet. You’re very smart, I know that, but you are restricted to the things you know. If something is beyond your realm of knowledge, it doesn’t make it entirely impossible. Besides, highly improbable things make for more fun. And here you are, standing in a spaceship that’s bigger on the inside and travels through time with an alien. What’s more improbable than that? But it’s happening.
“She wasn’t me. How could you not see that? Now she’s everywhere. She’s in my house, my job, my bed, and I don’t want to wear my clothes anymore, and I don’t want to live in my apartment, and I don’t want to be with you. She’s taken everything.”