“Who the hell are you and how’d you get on my ship?”
The person confronting the Doctor is waving some sort of mechanical tool and doesn’t seem very happy to see him.
“Your ship? It’s very nice.”
“You didn’t answer my question; how’d you get aboard? The last thing I need is a stowaway! I’m in the middle of a race!”
“Oooh, I like races. I’m the Doctor.”
“Doctor, huh? You’d better not turn out to be a saboteur; I’ve got a lot riding on this race, but my engine’s acting up.”
The Doctor beams happily. “Maybe I can help.”