(Nancy is hugging Jaime, nanogenes are flying around…)
Doctor: Come on, you clever little nanogenes. Figure it out. The mother, she’s the mother. It’s got to be enough information. Figure it out.
Rose Tyler: What’s happening?
Doctor: See? Recognizing the same DNA. (Doctor runs to Jamie) Come on. Give me a day like this. Give me this one. (takes of Jamie’s mask, revealing his face) Welcome back! 20 years to pop music, you’re gonna love it.
Nancy: What happened?
Doctor: The nanogenes recognized the superior information. The parent DNA. They didn’t change you because you changed them. Mother knows best.
Rose Tyler: What are you doing?
Doctor: Software patch. Gonna email the upgrade. You want moves, Rose. I’ll give you moves. (send nanogenes towards “The Empty Child victims”) Everybody lives, Rose. Just this once! Everybody lives!
From Doctor Who – Season 1 Episode 10: ‘The Doctor Dances’ (1×10)