TEGAN: I know we see so much death Nyssa, but... there's an invincibility I feel around the Doctor, even after Adric, though I'll admit I lost it for a while. I didn't mean to bring him up, I- I'm kinda hoping you can't hear me. I can't hear you at least.

DOCTOR: Just a thought.

TEGAN: A bad thought?

DOCTOR: I never have bad thoughts Tegan, not with you around.