Rose Tyler: Doctor, tell me what’s going on.
Doctor: I absorbed all the energy of the time vortex and no one’s meant to do that. Every cell in my body is dying.
Rose Tyler: Can’t you do something?
Doctor: Yeah, I’m doing it now! Time Lords have this little trick. It’s sort of a way of cheating death. Except… it means I’m gonna change… and I’m not gonna see you again. Not like this, not with this daft old face. And before I go…
Rose Tyler: Don’t say that!
Doctor: Rose… before I go I just wanna tell you, you were fantastic. Absolutely fantastic. And do you know what? So was I.
From Doctor Who – Season 1 Episode 13: ‘The Parting of the Ways’ (1×13)