The Doctor flips back insanely to his light and airy fun tone: "There we are, then! Thanks for that! Cheers, big fella!" He jabs the sword into the platform and everybody claps for him. Harriet and Rose congratulate him and he smiles: "Yeah! Not bad for a man in his jim-jams!" As Rose is putting the robe back on him, the Doctor makes reference to Arthur Dent, who traveled the world in a bathrobe and never forgot his towel; the Doctor says he was "a nice man," but maybe he's messing with your mind. I don't know. He suddenly produces a clementine from the bathrobe: "A satsuma. Ah, that friend of your mother's -- he does like his snacks, doesn't he? But doesn't that just sum up Christmas?" He plays catch with himself, tossing the orange and catching it as they walk back. "You go through all those presents, and right at the end, tucked away at the bottom, there's always one stupid old satsuma. Who wants a satsuma?" Caliban gets to his feet, roaring, charging, and without even turning, the Doctor nails a switch on the wall of the ship's outside with the clementine, dropping Caliban out into the air. As he falls, screaming, the Doctor's smile fades: "No second chances. I'm that sort of a man." Oh, the creepy kind. Gotcha. The Doctor explains to the Unkindness of Sycorax how it's going to go. "By the ancient rites of combat, I forbid you to scavenge here for the rest of time. And when you go back to the stars and tell others of this planet -- when you tell them of its riches, its people, its potential -- when you talk of the Earth, then make sure that you tell them this: It. Is. Defended." And with that, they exeunt, transmatting down to Bloxom Road, just around the corner from where you can just read the faded BAD WOLF on the grounds of the Powell Estates.
Mickey giggles and jumps about madly as the Doctor watches the Sycorax ship start up and take off. Rose jumps on Mickey's back, and they yell at the ship: "Go on, my son!" "Don't come back!" "It is defended!" Rose and Mickey embrace, and somehow poor Right-Hand Alex gets pulled into their crazy glee.
The Doctor and Harriet Jones embrace. "My Doctor," she says, overjoyed. So happy to have him back. "Prime Minister," he says, no less proud. "Absolutely the same man." They turn as one, and look up at the sky. "Are there many more out there?" she asks. She's thinking about safety, about areas of responsibility. "Oh, not just Sycorax. Hundreds of species. Thousands of them. And the human race is drawing attention to itself. Every day you're sending out probes and messages and signals -- this planet's so noisy. You're getting noticed more and more." He looks at her directly: "You'd better get used to it." Jackie approaches, loud as ever, as Harriet falls into a funk. She stares into space as the Tylers and Mickey jump around, congratulate Jackie on the tea, continue to discuss how he's the Doctor but he looks different, how it's the bleedin' Prime Minister, and the family hugs, Doctor and Rose and Jackie and Mickey, and the Doctor promises that he's all better. And suddenly terrifying Harriet Jones, Prime Minister, is approached by her right hand, with a message from Torchwood, who say they are ready. She closes her eyes and watches the family as they laugh, and chat, and dance together, reunited. And she makes a choice. The Doctor smiles at her from their happy reunion, and she gives her best in response...and tells Alex to fire. And he does. And in the sky there are Death Star bolts, from five locations across London, meeting up and joining up, and focusing on the Sycorax ship, and then it is destroyed.