Lieutenant Clark entered the cabin, sighing reluctantly. How dangerous could a simple glowing red ball be? It didn't sound all that terrifying, but it was his job, so he followed Clara anyway.

'All right,' he sighed when he saw Katie and Zack staring at the sphere on the bed. 'Let's see.' He bent down and reached for the glowing ball.

'No!' Katie exclaimed, reaching out to stop him. And she did so just in time. As she pulled his hand back, he felt the intense heat radiating off of the ball.

'What is that thing?' he asked the pilots.

Katie shrugged. 'Honestly, lieutenant, I don't know,' she answered. 'I just found it lying on my bed.'

'Was it always glowing?' Clark asked.

Katie shook her head. 'No,' she replied. 'I was fiddling with it until his started glowing.'

Clark looked down at the ball, half-surprised that it wasn't burning the dark grey comforter beneath it. 'Did you touch it?' he asked finally.

Katie glanced at him. 'Yeah, look.'

Clark turned to see Katie's outstretched hand. He took it gingerly and gazed at her fingertips.

He gasped. The edges of her fingertips on that hand were missing.

'Did that thing burn off your fingerprints?' he asked with incredulity.

'Lieutenant, look!' Clara shouted from behind him.

Clark turned around to see the sphere glowing a bright orange now. But when he looked closer, he could see the edges of Katie's fingerprints glued to the bright surface.

'It stole them!' Zack exclaimed. 'Katie, it stole your fingerprints!'

Clark gazed at the ball. 'And I think it's getting frustrated,' he said suddenly. It was obvious. The ball wanted Katie's fingerprints—for the gods know why.

Clara gazed at Clark. 'What do you mean?' she asked.

'I think that for some reason, whatever it may be, this sphere wants your fingerprints, Katie,' Clark explained. He saw the dark-haired girl wince lightly and exchanged glances with Zack.

'Do you think this has anything to do with the blue box?' Clara asked suddenly.

Clark looked at her. She had a point. 'Possibly,' he responded. 'But we can't be too sure. We'll have to report it to Commander Gelth.'

'I'll go,' Katie suggested. 'I found, it wants my fingerprints, I'm responsible.'

Clark gazed at her for a moment. 'Be careful,' he said finally. 'And whatever you do, don't touch it. We'll have to get it in some sort of container.'

Rather unprofessionally, Clark searched around the cabin. He looked through drawers and lockers. Eventually, he came to Katie's.

The brunette pilot stopped him. 'I'll do that,' she said quickly, opening up her own locker. She reached in and pulled out a small food container. 'Will this do?' she asked.

Clark nodded and took the plastic container. He scooped up the glowing ball, but to his terror, the ball slipped and brushed against his palm.

He felt nothing.

Confused, he cautiously reached his hand into the container.

'Lieutenant, what are you doing?' Clara asked in disbelief.

Clark ignored her and continued to reach into the container, when his fingers brushed against the ball's surface, he felt nothing. Nothing except for a smooth, cold, metal sphere.

'Katie, this thing burned you, correct?' he asked the pilot.

Katie nodded. 'And it took the tips of my fingerprints with it.'

Clark nodded and pulled the sphere out of the box. He fiddled with it in his palm, showing it to the incredulous faces of the pilots around him.

'Whatever that thing is, it definitely wants Katie,' Zack confirmed.

Clark watched Katie's expression go from bedazzled to horrified. 'But why me?' she asked fearfully. 'What's so special about me?'

'You're our top pilot,' Clark observed. 'Maybe it wants to get inside your viper.'

Katie gazed at the sphere in shock. 'Whatever it is, Commander Gelth needs to see it.'

Clark nodded and put the ball back inside the container. He handed it to Katie carefully. 'You are dismissed,' he said to the others, and the all retreated quickly, slipping away through the cabin.

Captain Red was not impressed. He ran his fingers through his thick orange hair and glared at the wall ahead of him. He had left the Doctor and Rose inside the interrogation room and had ordered them to stay put. Now whether or not they'd follow his orders, he didn't know.

He was on his way to Commander Gelth's cabin. Frustration pricked at him as he charged through the corridor, unable to think of how incredibly annoying that Doctor was.

He made it to the commander's quarters and knocked on the doorframe.

Gelth looked up from her paperwork. 'Come in,' she welcomed.

Red inhaled deeply and stepped through into the room. He took notice of the giant police box beside the door and gestured toward it. 'Have you figured out how it got here?'

Gelth smiled. 'Yes,' she replied. 'But I do not wish to inform you quite just yet. Have you figured out what he calls it?'

'At first he kept saying it was his ship, but then he said the name "TARDIS." I think that's what he calls it.'

'TARDIS…' Gelth echoed, sounding it out on her tongue. 'Interesting name.'

Red nodded. 'Commander, the interrogation isn't going so well,' he said finally.

'What, he isn't talking?' Gelth asked sarcastically.

Red shook his head in annoyance. 'Actually, he is talking. That's what's so irritating. He won't stop.'

Gelth chuckled gently. 'He seemed like the talkative type.'

Red nodded and was about to leave when he glanced at the police box once more. 'Commander,' he began timidly. 'If you don't mind, could I possibly have a look inside sometime?'

Gelth chuckled once more. 'Not yet, captain,' she instructed. 'For now, you are dismissed.'

Red nodded and saluted. Gelth saluted him back, and he made his way out of the cabin.

'What are you doing?' Rose whispered to the Doctor. She remained seated, no matter what he was doing.

The Doctor drew his sonic screwdriver along the doorframe, then toward the corners and vertices of the walls. 'This place is amazing,' he mumbled. 'I don't see how they do it.'

'Do what?' Rose asked, irritation pricking at her.

The Doctor slipped his device back into his inside coat pocket and turned to Rose. 'Are you coming?' he asked, ignoring her question.

'The captain told us to stay,' Rose pointed out.

The Doctor shrugged. 'I know,' he said nonchalantly.

Rose grinned and got to her feet. She followed the Doctor out of the cramped room and into the corridor. 'So where exactly are we?' she asked the Doctor.

He shrugged. 'You saw the image,' he said. 'We're on some sort of Battlestar. I think they called it Battlestar Perseus.'

Rose nodded, all the information slipping through one ear and out the other. 'And we're in the year 2125?'

'Apparently,' the Doctor murmured. 'But something was calling us here. What was that?'

'Doctor,' Rose muttered. 'What if the thing that called us here isn't friendly? It wouldn't be the first time.'

The Doctor shrugged. 'I guess we'll just have to find out.'

Rose shook her head in exasperation and followed the Doctor down the corridor. 'If I could just find the TARDIS…' he was mumbling, but Rose paid no attention. She was too busy gazing around the so-called Battlestar, wondering exactly where they were.

Suddenly, a navy blue schematic on the wall caught her attention. 'Doctor,' she said, walking up to it.

The Doctor stopped talking and made his way over to her. 'You never listen to what I'm saying. It gets frustrating sometimes…' But the Doctor's voice faded as he noticed the schematic. 'A map,' he observed. 'This could help.'

Rose watched as he drew his finger along the intricate drawings on the map. Apparently they were on Deck 14, Frame 17, Corridor 5. Kind of a random spot for the TARDIS to land, but Rose wasn't complaining.

'So where are we headed?' she asked, looking around the narrow corridor.

'Well, they took the TARDIS,' the Doctor observed. He straightened and turned to Rose. 'It's possible that Commander Gelth is inspecting it.' He paused and sighed. 'I wouldn't be surprised if she took it to dissect it.' He stopped and drew in a sharp breath. 'We've got to save her.'

Rose giggled. 'Who, the commander or the TARDIS?'

Katie Heartman slouched down the corridor, her gaze fixed on the plastic container. The ball glowed inside, and she could feel its heat burning the plastic. She'd have to make it to the commander's quarters as soon as possible.

Quickening her pace, she raced down the narrow hall. It wasn't long before she spotted Captain Red striding in her direction.

'Where're you off to?' Red asked.

'There's something the commander needs to see,' Katie explained. 'It's kind of a…glowing ball.'

Red looked down at the container and peered through the translucent plastic. After a moment, he burst out laughing.

'What's so dangerous about a glowing red ball?' he laughed.

Katie straightened. 'Well, what's so dangerous about a big blue box?'

Red regained his composure and straightened up. 'You are dismissed, soldier,' he said and saluted briskly before heading down the hall.

Katie sighed. It was probably going to take a lot for the commander to understand her plea about the metal sphere. It probably was connected to the police box somehow, but she shrugged off the thought and continued down the corridor to Commander Gelth's cabin.

'You may come in,' Gelth called from inside.

The first thing Katie noticed as she entered the room was that the already infamous police box was inside. She stopped and did a double-take at the box.

'Sir?'

Gelth looked up from her table and laughed lightly. 'I was inspecting it. What is it you need?'

Katie straightened and placed the container on the table in front of Gelth.

The commander looked up at her. 'What's that?'

'I believe you should look at it first, Commander,' she suggested formally.

Gelth glanced at her once more before reaching forward and taking off the lid of the plastic box. The ball was still glowing inside it, radiating heat about the temperature of a star. But when Gelth reached forward and picked it up, she didn't seem to flinch with pain at all.

'That's strange,' Gelth observed. 'I felt this thing's heat the second you placed it on the table. But why aren't I feeling anything now?'

Katie relaxed her shoulders. Maybe it would be easier than she thought to explain to the commander. 'I just found the thing laying on my bunk,' she explained. 'It wasn't orange then. It was a simple silver ball. I fiddled with it, until it started glowing and I threw it down. Look at what it did.'

Katie reached her hand forward and showed Gelth her burnt fingerprints.

'That's incredible,' Gelth whispered. 'So it hurt you, but it has absolutely no affect for me whatsoever.'

Katie nodded. 'Lieutenant Clark touched it too, and nothing happened,' she said.

Gelth stared up at her, fiddling with the sphere in her hands. 'So it wants you?'

'My fingerprints, to be more precise.'

Gelth looked down at the ball once more before placing it gently inside the container. 'Do you think this has anything to do with the Doctor and Rose?'

Katie blinked at her commander. 'I'm sorry?'

Gelth chuckled softly. 'They are the people—real human people—that we found in the police box.'

'There were people in there?' Katie asked incredulously.

Gelth nodded. 'They are very fascinating people. They speak in odd accents. But if this thing appeared the same time as the police box, then perhaps they are inter-connected.'

Katie nodded. 'That's what I thought, sir.'

Gelth nodded. 'I keep this. You are dismissed.'

Katie saluted and waited for the commander to return the action before leaving.