Lantro sat on the sand beside the diagram, staring at it and saying nothing, as the Doctor finished his explanation about the spokes and the rough drafts.

He seemed stunned.

"You realize this sounds crazy," Lantro said, at last. He gestured at the diagram. "All of it. Gigantic vaults! Rough drafts! It's..." He paused. Then slumped. "It's all true, isn't it?"

The Doctor was already tucking away his sonic screwdriver. "Oh, yes. Every word."

Lantro pointed at the TARDIS at the center. "And they placed the cannibalized TARDIS at the center of this whole thing? So if we travel down far enough, we'll find it?"

"Yes!" the Doctor said with a grin. Paused. The grin slid down his face. "No." Paused again. Scratched his head. "Maybe."

Lantro raised his eyebrows.

"Well, it's all just an artist's rendition, really," said the Doctor, using his sleeve to wipe out the drawing. "Something I knocked off from where Seo grew up. Could be that here, there's nothing in the center! Or a cannibalized TARDIS! Or a...!"

The Doctor drifted off.

For a long moment, he said nothing.

"No," he decided, turning on his heel and scaling the nearest sand dune. "No, that's daft." He clonked himself on the head. "It's a false positive, that's all. Has to be. No chance of finding any other Time Lords in here."

Then he sat down, and — with a shove — slid himself over the far side of the sand dune.

"Geronimoooooo! Ow!"

"So that explains Stenman-Hoyer," said Jenny. "Doesn't explain you." She crossed her arms, eyeing Kardeni up and down. "Putting aside your uncanny ability to speak Gallifreyan — and the fact that I suspect you've been fiddling with the stuff in this room a lot more than Stenman knows — you seem really worried about something getting out of this dimensional partition of yours. What did you call it? Abu-dabu?"

"Apos'alu," Kardeni corrected. She typed a string of text out onto the screen. "I found a message in the Old High Gallifreyan partition of the Battle TARDIS, a while ago. Hang on, I'll show you." She brought up the Old High Gallifreyan for Jenny on the screen. "'A warning to my fellow Time Lords: the War Council is...' I think that word's 'deceiving' or 'concealing something from'... 'you. The Apos'alu is trapped...' or wedged, maybe?" She pointed at the next line. "Then there's some stuff I don't understand. Then, something, something '...the inner partition. If it is ever opened, the...' something '...will emerge. The Apos'alu will regain its former power, and Gallifrey...' something, something. Then there's more stuff I don't understand." She scrolled down. And down. And down. "A lot more." Scrolled down again. "Oh, here we go. 'Do not trust the War Council or Rassilon. They will bring only...' I'm assuming that last word is something like 'ruin' or 'despair'." She grimaced, turning back to Jenny. "It's written in much more complex language than the computer code. I'm doing my best."

Jenny couldn't read any of it at all. She pointed to the name signed at the bottom. "Who's it from?"

"'Biv,' apparently." Kardeni glanced over at Jenny. "That name mean anything to you?"

It sounded vaguely familiar, but Jenny couldn't remember where she'd heard it before. "We have to find some way to send this to Dad."

Kardeni lunged out and grabbed Jenny by the arm. "No chance."

Jenny struggled. "But...!"

"He's a Time Lord!" Kardeni interrupted. She glanced at the words on the screen. "Whoever wrote that message knew other Time Lords would be after this thing. For all I know, your Dad's here to let it out!"

"He's not," Jenny insisted. "He'd never..."

"Well, he's doing it now!" Kardeni shouted, holding her more tightly. "His arrival was when the dimensions first started losing coherence. And now, his TARDIS is tearing the dimensions open even wider!" She got right into Jenny's face. "So just what are you three really here to do? Who really sent you? And how am I supposed to trust...?"

Someone leapt out of the shadows.

Jenny only just had time to glance over her shoulder as she felt herself grabbed from behind and ripped out of Kardeni's grip. Kardeni was staring at the person who had just emerged.

"What...? Who...?" Kardeni began.

The person grabbed up an old discarded monitor and thudded it on Kardeni's head. Kardeni's eyes rolled up, and she dropped to the floor with a thud.

"The name," said the person, clonking the monitor back onto the ground, "is Faye Mutajar." She reached into her pocket and brought out a chunky black vortex manipulator, and secured it around her wrist. "Remember it. It's one of the names you'll be cursing from your prison cell for the rest of your life."

As far as Yimi was concerned, the moment Seo finished explaining, everything seemed to happen at once. The cathedral collapsed behind them, spewing fiery debris across the landscape. The crowd screamed and tried to flee — dropping Yimi as they did so. Yimi took out Iporil's switchblade from her pocket and ran for Seo, cutting through her ropes and catching her as she fell.

"The captives!" Hyoli shouted, "they're getting away!"

But his voice was drowned out by the sound of a helicopter flying overhead, shooting down at the natives below. Yimi felt her heart pounding, as she watched the Patasi around her fall to the ground, howling in pain.

Seo grabbed Yimi by the hand, yanking her out of the way of the next hail of gunfire. And next thing Yimi knew, they were both running through the forest, desperate to get away from the Patasi and the humans and this whole crazy world that wanted to kill them.

"About what you said," Yimi said, her voice shaking as she ran, "about this being a draft of my world..." She yelped, as a Patasi arrow shot out of the darkness and nearly skewered her in the shoulder. Seo pulled her away, turning to the right — away from the scuffle that had produced the arrow. Yimi grimaced, then went on in a whisper, "...is there any way for me to get home?"

"Sort of?" Seo grimaced. "My rock-portal technique only works in one direction, actually. So that way's out. But I'm sure I'll figure out some way back, eventually." She shrugged. "Doesn't matter. We're not doing that yet."

Yimi felt her heart sink. "But if what you said is true, I have to warn my people...!"

"If you warn your people, Yimi," Seo cut in, sharply, "Stenman-Hoyer will consider that a 'failure'. They'll archive your timeline, stick it in their temporal vault, then travel back in time and correct their mistake. Or create something totally different. Or... who knows!" She gritted her teeth, tension and repressed anger flooding through her. "I grew up surrounded by redundant timelines. I've seen how this works. It's like what happened to Mom and all her happy endings — but on a planetary scale!"

Yimi didn't get the reference, but decided not to pry. She had enough of her own issues at the moment. "Then we have to find Abozalu. He will stop all this."

"If Abozalu's the Master," Seo muttered, "he's probably the one causing it in the first place." She sighed, continuing her sprint. "What about that other guy? The rainbow one."

"Rainbow one?" Yimi asked.

"Yeah, you remember!" Seo said. "Roy!" She paused, scratched her head. "No, that's not right..." Her eyes lit up. "Biv! That's it. What's his deal?"

Yimi glared at Seo. "He's the enemy of Abozalu."

"Oh, well he sounds like a great guy, then," Seo decided. "We're definitely rescuing him."

Yimi seethed.

"Look, Yimi," Seo said, "I know you're under the Master's hypnotic influence — but think about it. If he is behind all this, and trust me, he is, then his plans are about to destroy your own people. Who are you going to side with, in the end? Them? Or him?"

"Him," said Yimi.

Seo rolled her eyes. "Now you're just being difficult." She beamed, pointing just ahead of them and laughing, as she spotted the giant boulder jutting out of the ground. "Hey, look, it's on the surface this time! No more falling down mine shafts for Seo!"

Seo dragged Yimi forwards, towards the giant boulder. It was a very old rock. Ancient. As Seo placed a hand on the surface of the boulder, its surface seemed to turn to a liquid, rippling and gleaming like the surface of a pond.

Yimi gasped.

"Oh, right!" Seo laughed. "You didn't see this last time, because I had to access it as we fell past." She grabbed Yimi by the wrist, her eyes dancing. "Last one there's a rotten egg!"

And before Yimi knew what was happening, Seo had pulled her through.