Back at the restaurant, Rassilon had 12's TARDIS destroyed. 12 just stared at Rassilon and said, "Did you really think you could destroy my TARDIS that easily?" 12 activated his sonic screwdriver. Hiroki, Yui, Kai and 11 stood next to 12 as the TARDIS began materialising around him. When the TARDIS materialised fully, 12 quickly dematerialised the TARDIS.

When Rassilon saw this, he bellowed, "No! Doctor! Get back here at once!"

Inside the TARDIS, Kai asked 12, "Okay, that was amazing, how did you do that?"

"I set up an automatic preset on the HADS. The TARDIS is virtually indestructible now, give or take."

Hiroki asked, "So, Doctor, who's this Rassilon guy? Must have done something bad for him to hate you."

12 replied, "He's the founder of the Time Lord race. He invented the no-interference policy. He trapped me in my own confession dial. Because of him, I've been exiled, threatened and tortured. I've never forgiven him since. I exiled him from Gallifrey, but he shouldn't have been able to travel in time."

"Right, so what do we do now?"

"Three things. One, we're going to find out about your past. Two, we're going to drive those ships out of Natsuki's shop. Three, we're gonna send Rassilon back to the end of the universe."

Once the Doctors had the TARDIS safe from attack, 11 commented on 12's TARDIS console. "It's orange! Wow, there's a lot of stuff over there. What's with the background? Looks dark."

Meanwhile, 12 dragged Natsuki over to the TARDIS telepathic circuits. "Stick your hands in there. You don't have to try and remember anything; the TARDIS will do that for you. If your memories have been cut off or blocked, the TARDIS can extract them."

Kai asked, "What are you doing?"

"I need to see his past. What is it that makes people call him the Hybrid?"

After a little while, the TARDIS landed. 11 checked the TARDIS screen. "Apparently, we've landed on September 5, 1997."

Hiroki suddenly realised. "September 5, 1997. That means yesterday was the day that I was born." When everyone exited the TARDIS, they found themselves inside the Royal Children's Hospital in Melbourne. Looking around, they found themselves outside the nursery.

12 was looking into one of the windows. "There's a lot of new humans in there. What is it exactly we're looking for?" Hiroki was next to him, looking inside as well. He was too close that he was blowing fog onto the window.

Suddenly, 12 saw regeneration energy coming out of one of the babies. Hiroki noticed it too. "Hey everyone! I found something!" 11, Kai and Yui gathered behind 12 and Hiroki as they watched. The regeneration energy suddenly went into full blast. All the other babies around him sat up and chanted in a very long "aaaahhhhh", starting at low pitch then ending in a very high pitch. Suddenly, a baby next to the one emitting regeneration energy sits up, firing a blast of greenish-blue energy before the room fell silent and the babies fell back to sleep.

11 said, "What the hell was that?"

From nearby, a nurse appeared. She told the Doctors and the others, "Hey! You're not supposed to be in here, it's not even visiting hours!" 11 and 12 showed the nurse their psychic papers, telling her that they were government inspectors. The nurse said, "How can there be two John Smiths? Wait, you're not even government inspectors at all!"

12 said, "Run! Get back to the TARDIS!" The five of them quickly ran back, then 12 told Hiroki, "Put your hands in the telepathic circuits again!" The TARDIS took off right at that moment, but a flash of light transformed the entire TARDIS console into 11's retro console, forcing Hiroki to take his hands out of the telepathic circuits. 12 commented, "Oh, the days when I was young and rebellious. Hey, remember the wibbly lever?"

11 replied, "I love the wibbly lever!" He then explained to Kai and the others that since there are two of him from different time zones, the TARDIS is trying to compensate.

After a little while, the TARDIS landed. 11 checked the date on the monitor. "October 4, 2001, 5:30 PM. What's so special about this date?"

"The telepathic circuits took us here. That means there's something important in Hiroki's timeline that the TARDIS wants us to see," 12 answered.

Leaving the TARDIS, the Doctors and the others found themselves near a wax figure of the Beatles. Kai said, "This is Madame Tussauds Hong Kong. Yui and I came here on a holiday just last year. Well, from our point of view, that is."

Hiroki saw two people, a mother and son behind the Beatles. There was someone with a camera, likely the father, just across from them. Hiroki tried to go towards them, but 12 pulled him back, saying, "If that's your past self over there, then you can't stop anything that happens. You can't even let him notice you. Come over here." 12 led Hiroki behind some other wax figures.

The Doctors and the others watched as the father tried to take photos. The mother tried to get her son to look at the camera, but he was too distracted with everything else around him, including Paul McCartney's hair. Either the son was in a hurry or he was repeating things he had heard, because he was saying, "3, 2, 1, smile!" in Cantonese.

The father then turned the camera away towards the Doctors and the others, who hid themselves toward the walls. Then, they heard a slap. The mother said to the son, angrily, "I told you to look at Daddy and not to move, but you still decide to move. What is wrong with you? Do I have to break your bones to make you behave? Nah, I don't want this kid anymore. Let's bounce."

12 crawled out into the corridor as soon as the father turned his camera on his son. Hiroki followed and so did 11, Kai and Yui. They watched as the boy glowed with regeneration energy and his parents watched, not even noticing that their own son was regenerating, in pain. With every cry, the regeneration energy got stronger. Thinking that their son was only emitting energy to show his anger, his parents walked away, until the screaming suddenly stopped. The parents turned back to their son, who had collapsed.

Hiroki was about to stand up and transform into Decade when 11 and Kai stopped him. 11 said, "If you kill your parents, you'll be changing your own future. You should be glad your mum didn't slap you in the middle of your regeneration, otherwise you would have died."

Kai said, "I understand how you feel right now, but we are in the past. You could have already left your parents' house by now and no one would notice anything."

As Hiroki calmed down, the parents noticed them. The father said, "Um, who are you?"

12 stood up and showed the father his psychic paper. "I'm a doctor. I heard that something was wrong, so I just came around and saw everything. You'll have to excuse my assistants, they're with another patient right now. I'm a travelling hospital."

"Good, could you please check on our son, please? I'm afraid that we've killed him."

12 went to the boy, who was still lying on the ground in a pool of regeneration energy. His mother was crying, "I'm sorry! I'm sorry! I shouldn't have slapped you, Simon! Please wake up!"

Hiroki heard this. While 11 and Kai were holding him back against the wall, Hiroki was shouting, "That's a lie! That's a (beep)ing lie! You don't (beep)ing love me at all! (beep) you!" Kai knocked Hiroki out with a palm to the chest. 11 got Kai and Yui to take Hiroki back to the TARDIS.

Back with 12, he quickly checked up on the boy before he said, "Well, your son's going to be fine. You can take him away now. Don't worry about the remaining energy, it'll stabilise as time goes on."

The parents thanked 12 before they took their son away. 11 came over and watched as the pool of energy formed another child with a similar appearance to the boy who regenerated earlier. 11 said, "Let's take him back to the TARDIS. Give him some clothes and we'll drop him, let's say… in an orphanage somewhere in Japan."

After the Doctors had done that, they began running around the TARDIS library, searching for an answer to the question they had: how could someone regenerate into a new body and create another one at the same time?

Fact File: Where does this story take place?

This is a particularly easy question to answer. For 11, the story takes place between Series 6 and 7, when the Doctor has dropped Amy and Rory off in London and said goodbye. For 12, the story takes place between Hell Bent and The Husbands of River Song.