A Cyberman drags Jackie along, but lets go of her briefly as he informs his fellows that "Cyber Leader One has been terminated." While they download the pertinent files to each other, Jackie sneaks away. Her Cyberman proclaims that he'll be upgraded to Cyber Leader as she escapes down the stairs.
Jake orders his group to defend the lab, setting up comms and such. The Doctor puts on his 3-D glasses and stares at them. "Kill one Cyber Leader and they just download into another," says Jake. Everybody scampers, leaving the Doctor and Jake alone. The Doctor's flabbergasted, protesting that you can't just hop from one world to another like this. "We just did," says Jake, "with these." He tosses the Doctor a large yellow plastic button on a chain. "But that's impossible," says the Doctor. "You can't have this sort of technology." Jake explains that the Age of Steel has its own version of Torchwood (can you imagine?) and that the Steel Torchwood developed it. For good reason, as we shall see. "Do you wanna come and see?" asks Jake, proud of himself, and happy to see the Doctor again. The Doctor shouts a protest, but it's too late: Jake presses the button. They cross Hell to the other side, where Canary Wharf is a little worse for wear. All the shininess of our Torchwood gone down in war. There's equipment and stuff in piles. "Parallel Earth, parallel Torchwood. Except we found out what the Institute was doing, and the People's Republic took control." The Doctor urgently demands to go back: "Rose is in danger. And her mother." And who should appear but Peter Alan Tyler, the most wonderful man in both worlds, with a retinue of soldiers: "That'd be Jackie. My wife in a parallel universe. And as for you, Doctor, at least this time I know who you are." Pete's up to speed. The Doctor's proud but has no time for this: "Right, yes, fine, hooray. But I've gotta get back. Right now." Pete is calm, and strong. This is what dads do, in fairy tales: give you the rules. It's another kind of grace, the other side. The punishment and the limitation. This is Peter's world; this is what happens when the fathers come back to Sunnydale. "No, you're not in charge here. This is our world, not yours. And you're gonna listen for once." The Doctor falls silent, with a dark look.