A/N: I've always been extremely interested in Logopolis. I'm not really sure why. It may have been because it was my first real encounter with the Master, it may have been because it was the last of Tom Baker's stories, I don't know. But something about that story to me sets it apart from nearly every other serial and I felt that the Doctor and the Master had to revisit what happened when a major chunk of the universe was just blanked out of existence. To me, it's perhaps one the best serials that defines just who the two are.

TARDIS: The Tenth Doctor was sitting in his chair with his legs propped up on the control console as the TARDIS hurtled through time and space for parts unknown. He had just finished 'saving' the Titanic from certain doom and with Martha off getting her medical license, he found himself once more alone, a trait that was becoming more and more common these days. It wasn't something he was fond of, but sometimes even a Time Lord needed a little time off. And so he was finally getting around to his reading list which had been put off for far too long.

"It was the best of times it was the worst of times," thought the Doctor as he read the opening to A Tale of Two Cities. "Well that certainly seems apt."

But before he could even read the next line…

BONG BONG BONG

The sound of a cloister bell ringing startled the Doctor to the point that he fell off of his chair and crashed onto the metal grating below.

"Oh…what now?" the Doctor complained as he got back up. He walked over to the viewer console and flipped it on as he looked at the readings, which predictably made no sense.

"Terrific," the Time Lord thought, annoyed. He lazily walked around the console throwing various switches and levers. Yawning, he watched as the central column began pulsing as the sounds of the TARDIS dematerializing could be heard.

"Better go meet the neighbors," said the Doctor to no one in particular. He just shook his head at the empty console chamber before grabbing his coat and heading for the doors. As he exited, he was greeted by the sight of tall blocks of stone with small doorways carved into them. The Doctor noted this and kept moving along the deserted streets. A little concerned, the Time Lord used his sonic screwdriver to scan the air but it came up empty in terms of anything deadly in the air and so he continued on amongst the various stone buildings.

Time passed…

After an hour of searching and finding nothing, the Doctor was getting a little fed up with it all. He really wanted to leave and go somewhere else but the Cloister Bell only rang when there was an impending universe catastrophe and the Doctor couldn't ignore that warning, even if he wanted to. And so he continued walking, wondering how a deserted planet could cause anything. But before he could become even more bored, the sounds of activity finally caught his attention.

"It's about time," thought the Time Lord grateful as he made off for the noise. Racing through several more blocks, he finally happened upon a massive spaceship sitting in what must have been the equivalent of the town square. He watched as various human scientists and soldiers were wandering around the area with scanners and other items to investigate the area. Wasting no time, the Doctor walked straight up to a female giving out orders.

"Hello," said the Doctor with a big grin. The woman didn't even bother looking up.

"I suppose you'll be wanting your assignment," she said as she was busy looking at her padd that showed a layout of the city and where all the team members apparently were.

"Sure," said the Doctor mildly amused. The woman pulled up a section of the map.

"Search Grid 12-A for any signs of life or anything that can tell us more about this planet," the woman continued. She finally looked up at the Doctor.

"Where's your padd?" she asked looking at the Doctor.

"I uh-misplaced it," the Doctor lied as he patted down his coat but came up empty. "Sorry."

"Here you can take my extra one," the woman answered as she fished into her pocket and gave another padd to the Doctor who looked it over. "Next time be more…wait who are you?"

"I'm the Doctor," said the Time Lord offering his hand to the woman. The female was taken aback by this.

"You're not with the expedition?" she said surprised. The Doctor shook his head.

"No I was just passing through when this place caught my eye," he said before eyeing her ID tag. "So what are you doing out here Commander Tarrant?"

"I'm not saying anything until I figure out how you found your way into restricted space," said Commander Tarrant crossing her arms. "How did you get here? This area…"

"…Is restricted I know," said the Doctor nodding his head. "Can't figure out why though, there are no pathogens in the atmosphere, no noticeable technology on the surface, it's beyond me. What's going on here?"

Tarrant's eyes narrowed at him. "You're the strangest looter I've ever seen."

"The best usually are," answered the Doctor amused. Commander Tarrant started laughing despite herself.

"Well…maybe you're not a looter," she conceded. "But how did you get past the blockade?"

"It's easy when you're a Time Lord," answered the last of the species. Tarrant looked at him doubtful.

"The Time Lords are a myth," she said dismissively. "If they existed, the Marine Space Corp. would've found them by now."

"We're harder to find than you realize," said the Doctor slightly depressed at that statement.

"So is this your homeworld?" asked Tarrant as she looked through her binoculars at the research team.

"I'm afraid not," said the Doctor anxious to get off of the subject of his people. "What world is this?"

"We don't know," said Tarrant. "But if you're who you claim to be shouldn't you know? I mean you came here after all."

The Doctor shrugged helpless. "My ship brought me here by accident really. But this place does feel somewhat familiar. I think I've been here before."

"I don't see how," said Tarrant. "This world just suddenly appeared in a region of space that's been vacant of celestial bodies for the past several millennia."

"What?" said the Doctor confused.

"You really don't know what's going on do you?" said Tarrant at a loss. The Doctor slowly shook his head.

"Fine," said Tarrant slightly annoyed. "This whole region of the universe has been empty for millennia. We don't know what happened only that it did. No stars, no planets, no nebulas, zilch. And now this planet appears seemingly out of the blue along with its own star. It doesn't make any sense and because we were the closest vessel, the Marine Space Corp. sent us to figure out what's going on."

The Doctor nodded. "That is a bit odd I'll give you that. I have heard of planets moving before but rarely a star and without anyone noticing it? Curiouser and curiouser."

"So you'll help us?" asked Tarrant. She wasn't sold on him being a Time Lord but he had gotten here without them noticing but she doubted there was anything worth stealing given the cost of how long of a journey it took to actually get here from known space.

"Absolutely," the Doctor agreed. He pulled out his screwdriver again and altered the scanner with it and was heading off when Tarrant grabbed his arm.

"Until I figure out who you really are you're not leaving my sight," stated Tarrant. The Doctor looked at her hand then at her.

"I work alone," he swore.

"You either work with me or you find out everything we find out from our brig," said Tarrant refusing to back down. The Doctor just shook off her arm and walked off as she followed him. Rather than head for 12-A the Doctor just kept walking towards an unknown destination.

"Where are you going?" demanded Tarrant finally.

"Whatever is going on here, you're not going to find it in the middle of town," said the Doctor not stopping. "Civilians lived there, not anybody important. Typically the more important stuff occurs beyond the city limits."

Tarrant had never considered this. "Maybe you are a Time Lord."

"The last," said the Doctor bitterly. "The rest came and went in a war with the Daleks taking them with them. Death to the Daleks...and the Time Lords."

"Oh so that's where they went," said Tarrant. "I never actually fought against them but I heard some horror stories from my sister Jill."

"Yeah…," said the Doctor before something hit him. "I met her once she was looking for some cure to a disease that was ravaging your colonies. Funny, the Daleks were there too."

The two had nearly reached the city limits at the top of a long sloping hill. They stopped and then looked out amongst the city made of stone.

"Query," said the Doctor. "If a species was able to form a complex city grid like this and managed to form artificial living spaces inside of large stone blocks and yet have no visible technology, how did they pull it off?"

"They may have had technology and then left with all of it," suggested Tarrant.

"Possibly," the Doctor conceded as he squatted down and picked up some of the sand below them and rubbed it in his hand as it fell away. "Or else they didn't need it."

"What are you saying?" asked Tarrant. The Doctor stood up again.

"Nothing," he said shaking his head. "Just thinking aloud, now come on."

The Doctor held up the portable scanner and waved it around the area.

"Ah there we go, low level power source," said the Doctor pleased as he looked at the readout. Tarrant took out hers and looked at it.

"I don't read anything," she stated. The Doctor meanwhile was looking at a small rock formation jutting out of the ground and was moving his hands across it.

"It's definitely there," said the Time Lord as he thrust out his hand and his Sonic Screwdriver shot out into his hand. Tarrant immediately had her laser pistol in her hand pointing at him.

"Calm down," said the Doctor looking at her. "It's only a screwdriver."

The Doctor flipped on the device and began waving it around the rock but came up with nothing.

"Interesting," he said before taking out another device; this one much larger than his sonic screwdriver.

"Another screwdriver?" said Tarrant confused. "How many do you need?"

"Phillips," said the Doctor showing the first device and then switching to the other. "Flathead. Sonic…laser."

"Laser?" said Tarrant even more nervous as the Doctor waved both devices over the rock.

"I disabled the laser function," said the Doctor before adding. "Along with a few other features."

Finally aiming both devices at the rock, both activated and then the sound of gears moving was heard. Then a section of the rock wall retracted revealing an entryway with steps leading down into the darkness.

"Let's go," said the Doctor already heading down the steps.

"Wait," said Tarrant before producing her radio. "Scott?"

"Yeah," came the response.

"I've found something at the top of the hill so get your teams up here," said Tarrant putting the thing away. The Doctor blinked.

"You found something?" he asked doubtful. Tarrant sighed and ran her hand down her face.

"I'll explain you later," she promised. The Doctor just turned around and vanished into the darkness with only the LEDs from the screwdrivers lighting his way. They went down several flights of stairs until emerging into an underground bunker with various bits of technology around it. The Doctor walked over and flipped on the lights and sat down at one of the consoles as he put the Sonic Screwdriver in his mouth like it was a small flashlight as he pocketed the laser screwdriver and looked at the computer screen.

"Huh," he said leaning back in the chair and using his jaw to make the screwdriver rise and fall.

"What?" asked Tarrant taking a seat next to him. The Doctor leaned his arm on the armrest in an imitation of the classic thinker's pose.

"This equipment has telemetry for the various stars that should be in the sky above us but according to you are not," explained the Doctor. "But I can't figure out how this data can be here without a device to actually scan the horizons."

"Maybe it's hidden somewhere," suggested Tarrant. The Doctor nodded and got up.

"Yes there has to be a control panel here somewhere to raise the antenna," he stated before taking one last fleeting glance at the telemetry data. "Where have I seen that star chart before…?"

But he couldn't dwell on it as he looked through the various boards and switches.

"Dish Controls," the Doctor said pleased as he pressed a large red button and suddenly the whole room began shaking.

"Quake!" shouted Tarrant as she ran for the exit as small pieces of the ceiling began raining down. The Doctor grabbed her before she could bolt up the steps and held her underneath the doorway while the ceiling began slowly collapsing around them. Finally the shaking stopped and the Doctor looked up at the exit that had small stones along it.

"Let's go," he stated bolted up the stairs in his trainers. The Time Lord and the human emerged into the daylight and what they saw caused the color to drain from the Doctor's face.

"No, no, no, no, no!" he shouted at the heavens. Now rising high above the city of stone was a massive radar dish.

"What?" demanded Tarrant. "What is it?"

"It's can't exist, this can't be possible!" shouted the Doctor seemingly oblivious to her. "I saw this world burn! It was destroyed in the entropy!"

"What the hell are you talking about?" demanded Tarrant grabbing a hold of the Doctor and shaking him to try and get him to calm down. The look the Doctor gave her terrified her as it was the sign of a man who had seen a ghost.

"We've got to go," the Doctor insisted. "We've got to escape. We can't be here!"

With that he tore free of her grip and took one last look at the dish before doing what any sane person would have done in his position.

He ran.

Earth 2007: A lone pyre sat abandoned and alone in the middle of a wooded forest. The sound of lone footsteps was heard approaching the setup as a shadow fell over it. A hand appeared carrying a ring that was then pressed into the ashes and a bright light blasted out from the pyre as the ashes inside of it took on the form of a humanoid being.

"At last…," said the Master pleased as he looked up at the earthly sky. "It's about time you…"

The statement died in the Time Lord's throat as he saw who had revived him.

"H-hello o-old friend," stuttered the Doctor tightly gripping himself to try and stop his shaking. The Master sat up and looked at him.

"I take it this isn't a social call," he said resigned, throwing his legs over the side of the pyre.

"Something very bad has happened," the Doctor said calming down. "And we have to find out what."

"I don't see how this is my problem," said the Master standing up and brushing off the stray ashes from his body.

"It's both our problem," the Doctor commented darkly. "We're the cause of it."

"And that would be?" asked the rival Time Lord doubtful. The Doctor looked up at him sadly.

"Logopolis," he answered. The Master looked away from him as he sat back down in a mild daze.

"And why would you be so concerned about a destroyed world?" he asked frankly after a few moments.

"That's just it…," said the Doctor sitting down on the pyre next to him. "It isn't destroyed…."

"It's back,"