Jackson tries to accompany the Doctor for whatever he's going to do now, and the Doctor tells him to stay put. "You've got your son. You've got a reason to live." Jackson asks the salient question -- and the Doctor doesn't? -- but this sends the Doctor into a little fugue of his own, and they're both really sad for a second. Got it, Jackson nods, and he says goodbye. "God save you, Doctor," he says, and takes his son to safety.
The Doctor -- still carrying the Dalek thingy he broke off the other Dalek thingy -- runs up to Jeb, who's just been standing around I guess, and they get the TARDIS into the air. It's very exciting. And still, the Voice of Tapioca. "People of the world! Now hear me, your governments will surrender. And if not, then behold my power!" The CyberKing, not content with being huge and awesome, converts her fist into a huge gun, blowing the shit out of an alley, and then more and more exploding things. It is remarkable. What is she even doing?
The Doctor loads the infostamps into the balloon, is informed by Jed that he is "flamin' bonkers," and they finally get the balloon in the air. Meanwhile, Jackson introduces his son to Rosita, and she just sort of stares at them while the robot blows everything up and continues to wander around. Jed laughs in sheer delight as the Doctor lofts up toward the robot, and down below Jackson crows for it. Some dude's like, "The heck is that dude?" And Jackson goes, "His name, sir, is the Doctor!"
The Cybermen notice somebody getting close, and Mercy's like, "What? Check it out! So they Voltron the head around to look at him, and his hair going absolutely crazy in the wind. He aims the infostamps at her, and she's like, "Another man, come to assert himself against me in the night!" Which would be so, so compelling if any of this made sense. So the Doctor levels with her -- "You might have the most remarkable mind this world has ever seen, strong enough to control the Cybermen themselves" -- and she tells him to shove it, because she doesn't need his permission to be awesome, but he tells her she kind of does, because she's stomping on London and is going to die if she doesn't calm down. He offers to use the Dalek thingy from the other Dalek thingy to send her somewhere else where there aren't any people to Cyberconvert.
"I have the world below," Mercy points out. "And it is abundant with so many minds, ready to become extensions of me. Why would I leave this place?" Because he's going to stop her. "What do you make of me, sir? An idiot?" No, but that's not the question, the question is whether she's going to make him into the kind of a guy who blows up awesome robot-controlling ladies. She is firmly in the affirmative on that one, and he's sad. "You make me into this," he says, and fires vibes into the robot's mouth where she's hanging out. And nothing happens, so she laughs at him, but it's too hard to even care because A) this shit fell apart a good while ago and B) his hair is now Edward Cullen amounts of crazy, and it's really distracting.