The two Doctors had finished researching their theories about the regenerations they had seen earlier. They explained their theory to Hiroki, Kai and Yui.

11 started off. "Right, here's the thing. When a Time Lord regenerates, their whole body changes and it doesn't leave anything behind. But when we saw Simon regenerate back in Hong Kong, it left a pool of regeneration energy that formed into another body. However, the body that formed was a human body – which means that he can't regenerate if he is seriously injured."

12 continued, "But we took a DNA sample off Simon and analysed it. We found that it not only contains Time Lord DNA, but something that activated that DNA, allowing him to regenerate. Apparently, what we found was something called Jenova cells. People with autism have Time Lord DNA, but it's dormant, which means that they can't regenerate. But the Jenova cells activated the Time Lord DNA, which allows the person to regenerate, but it leaves a body behind."

11 added, "Now, that body could be the original person's new incarnation, or his new prototype. No one can really tell which one is which, but the two new bodies still retain memories of the original person from before the regeneration. Once the regeneration is complete, one of the bodies will be in limbo, whether it be the prototype or the original person. The body that is left behind will walk away to live his own life, while the body in limbo will slowly rematerialize back into the universe."

12 finished off by saying, "But there is a limit to this regeneration. Like other Time Lords, these half-human, half-Time Lord beings affected with Jenova cells can only regenerate a maximum of 12 times."

11 turned to 12 and said, "Yeah, speaking of 12 times, how can you be here?"

"Because I'm you, from the future. Haven't you realised by now?" 12 replied to 11.

"But I regenerated once, during the Time War. I regenerated again once the Time War ended. Life went as normal, then there was another regeneration, then Davros came back and I regenerated again, then the Time Lords tried to come back, then I regenerated into me. If I'm not mistaken, that's 12 regenerations. 13 bodies. If you're me, from the future, then how did you regenerate?"

"Spoilers."

"Oh, we're copying River now, are we? I'm telling you, you shouldn't have existed. I've used up all my regenerations. This body's all I've got left now."

12 sighed and told 11, "If I told you how I got this body, you wouldn't believe me until you saw it for yourself. Where are you now? Judging from what you're wearing, you're sometime between Amy and Rory. Hmm, you've got a long time to go. How about I give you this piece of advice: take it easy. Things aren't gonna come faster just because you want it. You need to take it easy and keep living your life as it is. Then soon, the answer will come in no time at all."

At that point, there was a knock on the TARDIS.

12 went to answer the door. "Yes, what is it?"

Natsuki gave him the envelope. "I have information about the Battle of Koshi Castle that you might like to know."

"How do you know about that battle?"

"It's not only me, but there's a number of us who were there. We're only trying to gather information on what really happened during that battle. I'm sure you'd want to know about it too."

Suspiciously, 12 glared at them, saying, "Thank you," then closed the door. Going back in the TARDIS, 12 announced, "Right, we're going to get rid of all those spaceships outside Natsuki's diner.

Fact File: Jenova (Final Fantasy VII)

In the aforementioned game, Jenova serves as the main antagonist. Its cells were used in experiments that have produced many of the other antagonists in the game. Details linking Jenova to the Time Lord hybrids will not be revealed due to spoilers.