This is of course Colin Baker, the Sixth Doctor.
Doctor: I have things to do, so I’ll make this quick.
One. There’s a temporal paradox rapidly developing here, or else you crazy kids would be getting no help from me. Two, the vampire is right. The reason you’re losing age is that you’re becoming increasingly less likely to exist. Amateurs should never attempt serious time travel!
Integra: It was unintentional.
Doctor: Exactly my point. Three, go to dinner. That’s all.
Integra: Who was that?
Alucard: The Doctor.
Heinkel: “Doctor” who?