VICKI: Then Bennett murdered my father. Then I've got nobody.

DOCTOR: My dear. My dear, why don't you come with us, hmm?

VICKI: In that old box?

DOCTOR: We can travel anywhere and everywhere in that old box as you call it. Regardless of space and time.

VICKI: Then it is a time machine?

DOCTOR: And if you like adventure, my dear, I can promise you an abundance of it. Apart from all that, well you'll be amongst friends. Hmm? Well? Now, suppose I leave you here for a moment to think about it, hmm?