The Doctor was working underneath the TARDIS console. The Stone beside him, pointing at different things as they chatted while working together. "Hey." They heard Amy beside the console.

"Hey." The Doctor replied before Amy pulled him out from underneath the console, the Stone frowned pushing herself out a little to see what was going on.

"Listen." She looked between them. "Can we talk?"

"Rory!" The Doctor suddenly shouted before wincing as the Stone hit him on the back of the head.

"Sorry, Amy." The Stone gave her an apologetic look. What do you need?"

"I've just got a question, that's all."

"You okay up there?" Rory said to the Time Lords looking up from under the glass.

"Yeah, fine, no problem." The Doctor replied.

"What are you doing?"

"Helping the Doctor and the Stone." Rory replied "It's humming. Is that okay?"

"Yeah, it's fine." The Doctor nodded.

"We're just entering conceptual space." The Stone added. "Basically-"

"Imagine a banana," the Doctor cut in. "Or anything curved." He then frowned as the Stone shook her head. "Actually, don't. It's not curved or like a banana. Forget the banana!"

"Er, is he helping you fly the TARDIS?"

"Detach servo-couplings two, seven and eleven, like the Stone showed you."

"How come he gets to have a go?" Amy asked. "You never let me have a go."

"He's my companion." The Stone shrugged. "I let him even when the Doctor started to pout not wanting him to touch the TARDIS."

"Er, Doctor, don't." Rory cut in also giving the Stone a pleading look. "Seriously. I let her drive my car once."

"Yeah, to the end of the road."

"According to Amy, there was an unexpected house."

"Ouch..." the Stone whispered to the Doctor.

"He's jealous because I passed my test first time."

"You cheated." Rory protested. "You wore a skirt."

"I didn't wear a skirt."

"That would have worked too." He nodded to the one she was wearing.

"No, no, I did wear a skirt." She blinked. "But it was any old skirt."

"Have you seen Amy drive, Doctor, Stone?

"No." They both replied.

"Neither did her driving examiner."

"Actually, it was this one." She said in thought. "It was this skirt."

The Doctor frowned for a moment before the TARDIS violently shook the console room going completely dark.

"What was that?"

"Rory?" The Stone sighed shaking her head. "Did you drop a thermo-coupling?"

"Sorry."

"Argh. How did you do that?" The Doctor groaned. "I told you, don't drop them. I specifically mentioned not dropping."

"Doctor its fine." The Stone told him taking his hand.

"It was my fault," Amy said making the Doctor and the Stone frown.

"Of course it wasn't your fault." The Doctor replied.

"It kind of was her fault."

"How could it be her fault?" He asked Rory.

"Because it was my skirt and my husband and your glass floor."

"Oh, Rory." The Doctor sighed.

"And this is why you wear really thick tights..." the Stone sighed shaking her head. "I learned that after the first time..."

"It was the only time!" The Doctor squeaked.

"I know." The Stone smirked. "I just like to tease you, sweetheart."

"Sorry." They then heard Rory.

"Never mind Rory." The Stone said through the glass as the Doctor pulled a lever, the lights coming back on.

"Well, we've landed. Emergency materialisation. Should be fine. Should have dropped off in the safest spot available."

"Oh..." the Doctor swallowed.

"Dear..." the Stone finished squeezing his hand. "That's not good..."

"Doctor, what's happened?" Amy worryingly asked.

"Safest spot available." He replied. "The TARDIS has materialised inside itself."

"Is that supposed to happen?"

"Take a guess."

"No Rory it isn't." The Stone said slowly walking up to the door of the TARDIS with the Doctor who lightly touched the other TARDIS.

"What are you doing?"

"We don't know." The Stone replied before opening the door and stepping inside. "Definitely not good." She said as the Doctor frowned looking at the TARDIS she just stepped through and then the door of the TARDIS they were in.

"Okay, that is a bit weird."

"Try your arm dear." He said frowning in thought.

The Stone did so poking her arm through the door.

"That is actually pretty cool."

"I'm glad you're entertained, Rory, now that we're stuck here for all eternity at least you won't be bored." He said stepping up to them as the Stone walked back through the TARDIS and joined him.

"Wait, what, we're stuck?"

"The inside of the TARDIS is now joined to the outside of the Tardis. Worse than a time loop, a space loop. Nothing can enter or leave this ship ever again."

"Okay, kids." The four spun around to see another Amy stood at the interior TARDIS door. "This is where it gets complicated."

"Oh, dear..." The Stone sighed pinching the bridge of her nose.

"Who the hell are you?" The Amy standing beside Rory frowned at the other.

"I'm you, from your future."

"Okay." The Stone nodded. "Tell us exactly what's happened."

"Well, the exterior shell of the TARDIS has drifted forwards in time. If you step into the box now, you step into the control floor a tiny bit in the past."

"I don't understand." the first Amy frowned.

"Neither do I."

"But you just said it."

"No, I'm just repeating it." She corrected her past self. "I'm just remembering what I heard myself saying when I was standing where you are now, and repeating it. I'm just repeating this too. And this, and this."

"Oh, I still don't understand." Amy groaned.

"You still don't."

"Okay." The Doctor interrupted the two woman. "When does Amy step inside the box. We need to maintain the timeline."

"Ah. As soon as she's slapped, Rory."

"Okay." Amy nodded as Rory blinked.

"Huh. No, why do I get slapped?"

"Because we have to stick to the established chain of events." The Doctor answered. "One mistake and the whole timeline could collapse. We could end up with two Amy Ponds forever, and then what would you do?"

Rory opened his mouth pointing at his Amy as she screeched slapping Rory around the face. "Okay, you." The Doctor took her shoulders pushing her towards the exterior TARDIS doors. "Into the police box now."

"And then I become her?" Amy questioned stopping by the door.

"Yes. Go, go, go!"

"Do I really look like that?" Amy frowned at the other.

"Yeah. Yeah, you do."

"Ooo." She glanced down at her skirt on the other Amy. "Nice choice for your driving lessons."

"I bet you would."

"Oh, this is how it all ends." The Doctor grumbled. "Pond flirting with herself. True love at last." The Stone sighed nudging him. "Oh, sorry, Rory."

"Absolutely no problem at all." He quietly replied.

"Humans." The Stone rolled her eyes. "You wouldn't catch me flirting with one of my incarnations."

"You would probably start mocking yourself about your sense of dress."

"I'm not as bad as you, you know." She pointed at the Doctor. "Need I remind you of the celery?"

"Yes, you're right." He nodded. "Now Amy."

"What's the first line?"

"Okay, kids, this is where it gets complicated."

"Gotcha." She nodded stepping into the second TARDIS.

"So, is that it?" The remaining Amy jumped up the stairs joining the three at the console. "Are we okay now?"

"No," The Doctor replied. "We're still trapped."

They looked around hearing the TARDIS door open again before seeing Amy and Rory now stood there as well as by the console. 

"What are you doing?" The Doctor frowned as the Stone groaned.

"The Stone told us to get into the police box," Rory replied answering his question. "Well, from your point of view she's about to tell us to get into the police box. From our point of view, she just told us to get into the police box, which is why we got into the police box, which is why we're here."

"Do I have to remember all of that?" The past Rory asked.

"It just sort of happens."

The future Amy waved at the other flirtatiously which the past Amy returned as the Stone pinched the bridge of her nose.

"Hi."

"Hi."

"Stop that." The Doctor scolded.

"Yes, I agree." The Stone nodded. "I really don't want to know about what happens behind closed doors with you two." She placed her hands on Amy's shoulders. "So it's best that you both go into the police box now. Run."

Without another word the Amy and Rory from the past left. "So, what now?" Amy questioned looking at the Time Lords.

"You two, stay where you are." The Doctor pointed at them.

"What are you doing?"

"I'm setting up a controlled temporal implosion." The Stone replied before seeing the horrified look on Amy's face. "I've done something like this before don't worry."

"It's the only way to rest the TARDIS." The Doctor replied. "But unless we find exactly the right lever to control the implosion, we're all going to die."

"You don't know which lever?"

"No. But we're about to find out."

Suddenly a second Doctor entered the TARDIS. "The wibbly lever!"

"The wibbly lever." He nodded as the Stone rolled her eyes not even going to correct them both as she pulled the lever and the Doctor beside her ran into the TARDIS as the police box dematerialised."

"Okay, we're back in normal flight." The Doctor walked up to the console nodding and squeezing himself between Amy and Rory his arms going over their shoulders. "The TARDIS is no longer inside itself, the localised time field is no longer about to implode and rip a hole in all causality. But just in case, Pond, put some trousers on."

"Or some thick tights."

"Yes or some thick tights." The Doctor nodded. "And then it's off with you two." He squeezed past them.