It's the best thing ever! [Donna agrees.] You can go to the beginning of the universe, the end of it, ancient Greece, space stations built thousands of years on. [It's almost infinite impossibility.]

I will warn you, there's a lot of running involved with the Doctor, though. Best keep a spare set of shoes handy for when you start wearing holes into the first set.

I'm sure he'd be open to your friends, too. [She'd make him be open to it.] Bunch of monster fighters? So long as none of you use guns, he'll be fine.