'So, where are we headed?' asked Clara, walking down the stairs that lead to the TARDIS console room.

The Doctor looked up from the controls. 'I thought you were still asleep,' he said in way of an answer.

'I was but now I'm not, so where are we going?'

'Are you sure you're not still asleep? You could be sleepwalking. It's an unfortunate habit in you humans. Gets you into a lot of trouble. I remember this one time…'

'Doctor!' Clara cut him off. 'You're rambling. What's going on? What aren't you telling me?'

'Nothing's wrong,' he said defensively. 'Why would anything be wrong?'

Clara gave him a look, which he recognised as her I'm-not-that-stupid look and he knew it was pointless lying. With an exasperated sigh, he leant against the railing and met her gaze.

'Fine. There is something wrong.'

'You cave so easily,' said Clara. 'So, go on, spill. What's up?'

'I don't know where we are going. Either the TARDIS is choosing her own destination, or…'

'Or?'

'Or she's being controlled by an external force.'

'But that's impossible. Isn't it?'

The Doctor was silent for a moment before standing up straight again.

'I'm sure it's just the TARDIS,' he said. 'She probably just wants a holiday. She's getting on a bit, you know.'

Clara wasn't convinced and she was just about to say as much when the console room shook violently and they both fell to the floor, the sound of a loud bell echoed through the room. After a moment the shaking stopped and the TARDIS fell silent.

'Clara?' the Doctor called. 'You okay?'

'I'm alright,' she called back, picking herself up off of the floor and joining him at the console. 'What happened?'

'We've landed. But I still don't know where.' He whacked the screen with his hand and growled in frustration. 'She's not telling us anything.'

'Well, there's no use sitting around here chin-wagging,' said Clara, turning towards the doors. 'Let's go take a look.'

She was just about to grab the handle when she noticed that the Doctor hadn't followed her. She looked around and saw a familiar expression on his face. 'Clara…' he began.

'I know it could be dangerous, Doctor. And I know you have a duty of care but what else are we supposed to do? Just sit here and wait?'

'I suppose you're right,' he sighed and joined her at the doors. 'Just let me go first.'

Clara gave an "after you" gesture and he opened the door, peeking his head out first to see if the coast was clear. Once satisfied he stepped out fully, closely followed by his companion.

'So far, so good,' he said, eyeing the room in which the TARDIS had landed. It didn't seem like anything special – just a basic office really. A desk. A chair. Window. Blinds. Nothing unusual at all, except…

The Doctor moved towards the desk and picked up what appeared to be a fang.

'What is that?' asked Clara.

'It's a tooth.'

'I can see that. I mean, what species is it from? It looks pretty vicious.'

'Oh yes,' agreed the Doctor. 'The Hoix are definitely that. Combine this with its twenty pals and then add the claws and bad breath and you have one alien you do not want to meet in a back alley. I wonder what it's doing here.'

'Do you think we're at UNIT? Could they have brought us here?'

'Good thinking,' said the Doctor and Clara smiled proudly. 'But no.' Her smile faded. 'If it was UNIT, there would be soldiers waiting to greet us… or rushing in pointing guns at us. Where is everyone?'

He put the tooth down and cautiously opened the door leading to the corridor. It was just your average corridor. Fluorescent lighting and brickwork walls with pipes lining them at the top. Still, the Doctor couldn't shake the strong sense that he had been here before.

'Maybe they all popped out for lunch?' speculated Clara. 'Or maybe it's a Public Holiday.'

The Doctor didn't reply, he just continued down the hall.

After turning a couple of corners, the Doctor suddenly stopped.

'Watch it!' said Clara after literally walking into him. The Doctor ignored her complaint.

'Shh! Do you hear that?' he whispered.

'Hear what?' she whispered back, angrily.

With a move reminiscent of her first Doctor, he was on the ground with his ear pressed against the concrete.

'Sounds like a battle,' he said. 'Quite a way down, though. We must be in very tall building… or they have one hell of a basement.' He got back to his feet and wiped the dust off his hands. 'Come on; let's find out where we are. I have the strangest feeling that I've been here before.'

He continued down the corridor. Clara made to follow but stopped, catching sight of something on the floor. 'Doctor…' she called, picking up a torn newspaper.

He made his way back to her and peered over her shoulder. 'Saxon leads opinion polls,' he read. 'Oh that's very very not good.'

'I remember,' said Clara. 'At least he wasn't in power for long.'

'Longer than you realise,' muttered the Doctor, turning away. Clara was about to ask him what he meant when the building shook and she had to grab the wall for support.

'One hell of a battle,' said the Doctor. 'What's the date?' he asked.

She looked at the page in her hands. '17th of July, 2007,' she read.

'July 2007. July 2007, he repeated. 'That rings a bell. Something important happened this day.'

'Yeah, it does sound familiar,' agreed Clara. She thought for a moment before it came to her. 'Hang on,' she said. 'Wasn't that the date of the Battle of Canary Wharf?'