DOCTOR: What do you want, Psi, more than anything else? Whatever it is, it's in this bank. You agreed to rob the most impregnable bank in history. You must have had a very good reason. We all must have. Picture the thing you want most in the universe, and decide how badly you want it. Well?

PSI: Still don't understand why you're in charge.

DOCTOR: Basically, it's the eyebrows.