Doctor Who: Last of the Time Lords/Ice of London

This is the fourth episode of Doctor Who: Last of the Time Lords.

Plot
Doctor: Katherine, you're finally home.

Katherine: Doctor... Thank you. For everything. You've shown me everything you could in this time, and I didn't even ask for any of it. Doctor... I might want to go on another adventure sometime. Not with UNIT. With you.

Doctor: Well, I will also appreciate your presence as you conclude in returning to this Time And Relative Dimension In Space sometime later, but for now, you plead for your absence, so I release you under your request.

Katherine: I expected you to say "bye," but that's good enough.

Doctor: They always leave...

Katherine: I'm sorry, what?

Doctor: Nothing... Temporary accident... *snaps* You may leave.

Katherine: Goodbye, Doctor.

Doctor: Goodbye, Candel.

The TARDIS door is closed, then reopens.

Katherine: Doctor-

Doctor: I thought you were leaving.

Katherine: I am, but I need you to see something outside...

Doctor: Give me a three-word reason why I should.

Katherine: Ice of London.

Doctor: Ice?

Title sequence plays.

Doctor: Ice? ICE? What do you mean "ice?" There shouldn't be ice at this time of the year!

Katherine: A-

Doctor: Shut up! I told you to give me a three word reason! Not a four word reason!

Katherine: Please, Doctor-

Doctor: SIX WORDS? Uggh. You Pudding Brains and your Pudding Brain grammar.

Katherine: ICE WARRIORS!

Doctor: Eight words- Wait, how do you know about Ice Warriors?

Katherine: I was in UNIT, you know-

Doctor: FOURTEEN WORDS! Katherine, I'm going to have to ask you to leave this TARDIS immediately. I'll be out there in a minute, and I expect you to say no more than five words for the rest of the day.

More to be added!