The Doctor:  Ace , where do you think you 're going ?
Ace: Perivale .
The Doctor: Ah , yes , but by which route - the direct route with Glitz or the scenic route ? Well , do you fancy a quick trip ' round the twelve galaxies and then back to Perivale in time for tea ?
Ace: Ace !
The Doctor: But there are three rules . One : I 'm in charge .
Ace: Whatever you say , Professor .
The Doctor: _ Two _ : I 'm not the Professor . I 'm the Doctor .
Ace: Whatever you want .
The Doctor: And the third ... Well , I 'll think up the third by the time we get back to Perivale .