I’m the Doctor

The Doctor: Right then, follow me.
Rickston Slade: Hang on a minute. Who put you in charge, and who the hell are you anyway?
The Doctor: I'm the Doctor. I'm a Time Lord. I'm from the planet Gallifrey in the Constellation of Kasterborous. I'm 903 years old and I'm the man who is gonna save your lives and all 6 billion people on the planet below. You got a problem with that?
Rickston Slade: No.
The Doctor: In that case… allons-y!

"Doctor Who" Voyage of the Damned (2007)