The Doctor and Elise landed on something squishy and nasty smelling. Amy landed next to them as the Doctor pulled out his sonic screwdriver.

Elise did the same and pressed the button. It made a buzzing noise just like the Doctor's only the tip of his was green and hers was yellow.

The Doctor smiled seeing the tiny Timelord copy him. "High speed air cannon. Lousy way to travel", he told Amy.

"Where are we?"

"Six hundred feet down, twenty miles laterally, puts us at the heart of the ship. I'd say Lancashire. What's this then, a cave? Can't be a cave. Looks like a cave".

Amy flung some of the stuff at the Doctor. "It's a rubbish dump, and it's minging!"

"Yes, but only food refuse. Organic, coming through feeder tubes from all over the ship".

"The floor's all squidgy, like a water bed".

Elise noticed it too and bounced lightly.

"But feeding what, though?" the Doctor asked.

"It's sort of rubbery, feel it. Wet and slimy", Amy told him.

There was a growl or a groan and the Doctor and Elise realized where they were.

Elise tugged on the Doctor's jacket and pointed at her tongue.

"Right you are, Elise. Amy, it's not a floor, it's a... So..." the Doctor said.

"It's a what?" Amy asked.

"The next word is kind of a scary word. You probably want to take a moment, get yourself in a calm place. Go omm".

"Omm..."

"It's a tongue".

"A tongue?"

"A tongue. A great big tongue".

"This is a mouth. This whole place is a mouth? We're in a mouth?"

"Yes, yes, yes. But on the plus side, roomy".

"How do we get out?"

The Doctor started scanning with his screwdriver. "How big is this beastie? It's gorgeous. Blimey, if this is just the mouth, I'd love to see the stomach".

The creature grumbled.

"Though not right now", the Doctor added.

"Doctor, how do we get out?" Amy asked him.

"Okay, it's being fed through surgically implanted feeder tubes, so the normal entrance is...closed for business".

Behind them was a wall of large teeth.

"We could try, though", Amy said.

"No, stop, don't move", he told her as the floor started vibrating, "Too late. It's started".

"What has?"

"Swallow reflex". The Doctor pointed his sonic screwdriver at the mouth.

"What are you doing?" Amy asked him.

"I'm vibrating the chemo-receptors".

"Chemo-what?"

"The eject button".

"How does a mouth have an eject button?"

"Think about it!"

Elise's eyes went wide as she noticed a wave of vomit coming towards them.

The Doctor grabbed her and held her close to his chest. "Right, then. This isn't going to be big on dignity. Geronimo!"

Amy screamed as it got closer to them.

They eventually landed in an overflow pipe.

Elise coughed as the Doctor set her down. She wobbled on her feet, the smell making her feel a bit dizzy.

He reached out and grabbed her to keep her from falling over. "Woah, easy there".

Amy sat up next to her.

"There's nothing broken, there's no sign of concussion and yes, you are covered in sick", the Doctor told her.

"Where are we?"

The Doctor started to sonic the controls next to the door. "Overspill pipe, at a guess".

"Oh, God, it stinks".

"Oh, that's not the pipe".

"Oh".

Amy took a moment to sniff her nightie. "Phew. Can we get out?"

"One door, one door switch, one condition. We forget everything we saw. Look familiar?"

A Forget button lit up.

"That's the carrot. Ooo, here's the stick".

Two Smiler booths lit up.

"There's a creature living in the heart of this ship. What's it doing there?" the Doctor asked.

The Smilers' heads turned. They now had frowns on their faces.

"No, that's not going to work on me, so come on. Big old beast below decks, and everyone who protests gets shoved down its throat. That how it works?"

The heads turned again with scowls on their faces this time.

Elise grabbed the Doctor's hand in fear. She did not like those machines.

"Oh, stop it", the Doctor told them, "I'm not leaving and I'm not forgetting, and what are you fellows going to do about it? Stick out your tongues, huh?"

The booths opened up and the Smilers stepped out.

"Doctor?" Amy asked.

Liz 10 appeared behind them and shot the Smilers.

"Look who it is. You look a lot better without your mask", the Doctor told her.

"You must be Amy. Liz. Liz 10".

Amy shook her hand. "Hi".

"Yuck. Lovely hair, Amy. Shame about the sick".

The little girl Mandy entered the tunnel.

"You know Mandy, yeah? She's very brave", Liz told them.

"How did you find us?" the Doctor asked her.

"Stuck my gizmo on you". She tossed the Doctor a tracking device. "Been listening in. Nice moves on the hurl escape. So, what's the big fella doing here?"

"You're over sixteen, you've voted. Whatever this is, you've chosen to forget about it".

"No. Never forgot, never voted, not technically a British subject".

"Then who and what are you, and how do you know me?"

"You're a bit hard to miss, love. Mysterious stranger, M O consistent with higher alien intelligence, hair of an idiot".

The Doctor tried to run a hand through his hair, forgetting that it was sticking to his scalp because of the sick. Elise patted his hand, telling him in her own way that she liked his hair.

"I've been brought up on the stories. My whole family was", Liz told him.

"Your family?"

The Smilers started to move.

"They're repairing. Doesn't take them long. Let's move". Liz led them through a basement as she explained how she knew the Doctor. "The Doctor. Old drinking buddy of Henry Twelve. Tea and scones with Liz Two. Vicky was a bit on the fence about you, weren't she? Knighted and exiled you on the same day. And so much for the Virgin Queen, you bad, bad boy".

The Doctor looked down at Elise, who was oblivious to what Liz 10 was insinuating. "Liz Ten..."

"Liz Ten, yeah. Elizabeth the Tenth. And down!" She turned around and gave them just enough time to duck before she shot the Smilers again. "I'm the bloody Queen, mate. Basically, I rule".

They entered a corridor and the Doctor stopped to observe the tentacles banging on the bars.

"There's a high-speed Vator through there. Oh, yeah. There's these things. Any ideas?" Liz 10 asked.

"Doctor, I saw one of these up top. There was a hole in the road, like it had burst through like a root", Amy told him.

"Exactly like a root. It's all one creature, the same one we were inside, reaching out. It must be growing through the mechanisms of the entire ship".

"What, like an infestation? Someone's helping it. Feeding it. Feeding my subjects to it. Come on. Got to keep moving", Liz 10 said walking off.

Mandy followed after her, leaving the Doctor, Elise, and Amy.

Elise's eyes filled with tears as she watched the tentacles. She reached out to touch them, but her arm was too short. Did they know what they were doing to the poor creature? Why couldn't they hear it?

"Doctor? Elise?" Amy asked.

"Oh, Amy. We should never have come here". The Doctor gently pulled Elise away from the bars. "Come along, Elise".

They followed Liz 10 to her state rooms, where they cleaned up.

There were glasses of water all over her floor.

"Why all the glasses?" the Doctor asked her.

"To remind me every single day that my government is up to something, and it's my duty to find out what".

The Doctor picked up her mask. "A queen going undercover to investigate her own kingdom?"

"Secrets are being kept from me. I don't have a choice. Ten years I've been at this. My entire reign. And you've achieved more in one afternoon".

"How old were you when you came to the throne?"

"Forty. Why?"

"What, you're fifty now?" Amy asked, "No way".

"Yeah, they slowed my body clock. Keeps me looking like the stamps", Liz 10 explained.

"And you always wear this in public?" the Doctor asked.

"Undercover's not easy when you're me. The autographs, the bunting". "Air-balanced porcelain. Stays on by itself, because it's perfectly sculpted to your face".

"Yeah? So what?"

"Oh, Liz. So everything".

The door opened and a man entered, along with a group of people in black robes.

"What are you doing? How dare you come in here!" Liz 10 told them.

"Ma'am, you have expressed interest in the interior workings of Starship UK. You will come with us now", the leader said.

"Why would I do that?"

The man's head turned as he became a Scowler.

Elise jumped back and hid behind the Doctor.

"How can they be Smilers?" Amy asked.

"Half Smiler, half human", the Doctor explained.

"Whatever you creatures are, I am still your queen. On whose authority is this done?" Liz 10 asked them.

"The highest authority, Ma'am", the man said.

"I am the highest authority".

"Yes, ma'am. You must go now, Ma'am".

"Where?"

"The Tower, Ma'am".

I'm sorry, but I just loved writing Elise copying the Doctor because it's exactly what a child would do!