The Planet of the Dead.
Oh, it has another name, but the Lady Christina de Souza doesn't care about it. All she can think about is that it was the planet that brought her to the Doctor. The Doctor, the Time Lord, the magnificent man with fantastic hair who waltzed into an impossible situation and made it possible and so much more. How is it that a man who knows and has seen so much could look so sad and lost? She thinks she knows, but it is not until they return to Earth that she finds out for sure.
They climb out of the bus; the passengers are crying and laughing with relief. Christina runs to the Doctor, who is leaning against a blue police box. She can hear Macmillan saying in the background, "She is not getting away this time," but she ignores it. Instead, she plants herself in front of the Doctor and says, "Little blue box, just like you said. Right then. Off we go. Come on, Doctor, show me the stars."
He gives her a sad look. "No."
"What?"
"I said no."
"But… I saved your life," Christina protests, confused. "And you saved mine."
He's still giving her that look. "So?"
"We're surrounded by police. I'll go to prison," she says desperately.
"Yeah," the Doctor agrees quietly.
"But you were right," the thief argues. "It's not about the money. I only steal things for the adventure, and today with you…" She sighs. "I want more days like this. I want every day to be like this. We're made for each other, you said so yourself. The perfect team." Oh, how she wished he would stop looking at her like that! "Why not?"
He finally looks her in the eye and there is something in them that is shattered, broken beyond repair. "People have travelled with me and I've lost them," he responds hoarsely. "Lost them all. Never again."
That detective, that irritating pest of a detective walks up to them and says loudly, "Lady Christina de Souza. Oh, I have waited a long time to say this. I am arresting you on suspicion of theft. You do not have to say anything, etcetera, etcetera. Dennison, take her away."
She's about to let herself be handcuffed when a voice whispers urgently in her head: "Don't let him go." She blinks, shaking herself. She must be more rattled by her day than she thought. But then it comes again: "Go with him. His song is ending soon, but it doesn't have to. However, if you let him leave without you, it will end." Christina stops in mid-step. She's not averse to having a conversation with herself, but this is unusual, even for her. It doesn't even sound like her thoughts. She looks back to the Doctor, a thoughtful expression on her face. He raises an eyebrow. "Hold on a sec," she says to the man trying to cuff her. He tries to argue, but she darts back up to the Time Lord leaning against his blue box.
"Are you honestly telling me that you're never going to take another person with you to the stars again?" she asks him, frowning.
The Doctor hesitates.
Christina nods. "I thought so. And you know what?" she continues, drawing so close to him that she can smell his scent of wood and rain and time. "I'm thinking that if you're gonna take someone with you to see all those amazing things, I want it to be me." She puts her hands on his chest, curling her fingers around the lapels of his suit jacket.
The Doctor squirms, looking uncomfortable. "Christina…"
She rolls her eyes. "Yeah, yeah, I know, you don't want to lose anyone, and you don't want a relationship at the moment. So good thing for you," she chirps, jumping away from him, "I don't want a relationship either. I want a best friend, and I have no intention of being lost. But I am coming with you."
"And what makes you think that?"
The thief grins and holds out her hand. "'Cause I've got your sonic screwdriver."
The Time Lord's hand flies to his chest pocket. "You—Oi!" he exclaims, looking indignant. "You can't do that!"
"Already did," she says, winking. "So here are my terms. You take me with you to see the stars, and I'll give it back to you. After the trip's over. Otherwise…" She flips it in the air. "It's mine."
He runs a hand though his hair, disgruntled. "I can just make another one, you know."
"Ahh, but it won't be this one. And do you really want me running around with one of these?"
He tilts his head. "Fair point." Turning around, he unlocks the doors of the police box. "But you get one trip and one trip only! I mean it!" He glares at her. "Well come on then! You're not going anywhere except prison if you just stand there looking silly," he says, and walks into the box.
Christina looks behind her as Macmillan marches up to her. "He's right!" the detective barks. "You're not going anywhere except for prison, and going into a box isn't going to help you. Even if it is a police box," he adds as an afterthought.
There's a huge grin breaking out upon her face, and the detective notices. "What's so funny?"
"What's so funny?" the Lady echoes, chuckling to herself. "What's funny is that even now, you still think you're going to arrest me. And I'm going to see the universe." She's laughing loudly now. "I'm going to see the stars!"
And with that, Christina de Souza leaps up to the blue box, opens the door, and disappears inside. The flustered police officer starts to protest, but his voice is drowned out by a loud whooshing noise that comes from the box as it fades from sight before his eyes.