A/N: This takes place between the Waters of Mars and the End of Time, for the Doctor, and after the Last Olympian, for Percy Jackson. I wrote it to help explain something that has always puzzled me about Doctor Who. Enjoy!

Disclaimer: If I claimed to own either Doctor Who or Percy Jackson, I would probably be destroyed by a team of cybermen and cyclops working together ...

Daleks and Demigods

Chapter 1: The Beginning

The Doctor didn't bother to set any coordinates for the TARDIS, he simply set her in motion and then let her pick a random destination – any planet, any time. Anything to get his mind off the Ood he had just seen.

"Just make it some where sunny, OK? A beach would be nice, too."

After about ten seconds of hanging onto the railing for dear life (the Time Vortex had been acting up more than usual recently; he would need to check it out soon), the Doctor got up, brushed off his coat, and went to open the door and see where the TARDIS had landed. He opened the door, hoping to see a beach, and he did. But, apparently, this wasn't a public beach, because he was surrounded by a bunch of teenagers in orange shirts, pointing an assortment of bronze weapons at him.

The teenager in front, a boy of about 16 with dark hair and green eyes older than his face, spoke up, "Who are you and how did you manage to get in here?"

"I'm the Doctor!" the Doctor said with a cheeky smile, then put up his hands quickly. "Don't shoot."

"Doctor who?" the boy asked, confused.

"Just the Doctor. I was looking for a beach, but this obviously not the one I want, so I'll just be on my way." The Doctor started to back into the TARDIS. He did not need a confrontation with armed adolescents at the moment.

"Oh, no, you're not leaving until you tell us how you got into camp. Nothing is supposed to be able to appear here unless we want it to. And, what is that box you just got out of?" This came from a blond, gray eyed girl next to the dark haired leader.

The Doctor looked carefully at them – they didn't look like trouble (besides the weapons), they just looked like they were protecting their home. He looked around. "Alright, this looks like Earth, the U.S. - New York, maybe?" He held out his finger and then licked it, "Yep, definitely New York - 21st century." The Doctor looked at his confounded opponents. "But if this is the 21st century, how did you get a teleportation restriction field and why didn't it stop me? Who are you? You're not ordinary humans, that's for certain."

The blonde girl looked at him as if she was wondering whether or not torture would be an effective strategy for getting him to talk. Apparently, she decided against torture, because she began to speak, "I'm Annabeth Chase, this is Percy Jackson. You're in Camp Half-Blood, a home for demigods. You see-"

"Demigods!" the Doctor interrupted, excitedly. "I haven't seen demigods in years! Which gods?"

Annabeth looked astounded at the Doctor's acceptance of her claim. "Well, um, the Greek ones ..."

"They're still around? I thought they would've died out years ago."

"Gods don't die."

"You know what I mean – fade. I hadn't heard anything about them in years, so I assumed they had faded." the Doctor looked nostalgic.

Percy looked at him suspiciously. "How do you even know about demigods?"

"Oh, I met some of your ancestors a long time ago – I was on trail of some Vespiforms, ran right through the middle of the Trojan war, and did Odysseus a favor – nothing major, but I ended up with a crash course in Demigods 101."

The teenagers looked at him thunderstruck. "Who are you?" Annabeth repeated.

The Doctor sighed and then launched himself into his amply practiced speech, "I'm the Doctor. I'm the last of the Time Lords. I'm from the lost planet of Gallifrey in the constellation of Kasterborous. I'm over 900 years old and I have the power to travel through time and space. The box behind me is called a TARDIS – that stands for Time and Relative Dimensions in Space – and is my ship."

The kids of Camp Half-Blood had heard plenty of these grand speeches before, but they were usually coupled with something really impressive, like flashes of lightning or hurricane strength winds. Yet, even though the Doctor did nothing amazing like these demigods were used to, they were still really impressed. There was just something about the Doctor …

Percy was the first person to break free of the Doctor's spell. "So, what you're saying is that you're an alien who travels though space and time and are here for absolutely no reason?"

"Yep," the Doctor replied, popping his "p". "So, do you want help keeping people like me out of here?"

The demigods nodded their assent looking dazed.

"Alright, then! First things first – have you got a banana? I always work better when I've got a banana. Ah, thank you. Now, who are you usually able to keep out of here and what do you use to do it?" He shoved one hand in his pocket and began to rock back and forth on his feet, waiting for the teenagers' answers.

"Well-" Annabeth took a deep breath, "monsters. There is a magic field cast over this entire camp that keeps all monsters from being able to enter or appear inside the camp."

The Doctor looked at them blankly. "Monsters? And magic? When you say m- never mind. I think I have an old atmospheric-teleportation-limiter-thingy in my ship. I'll just go get it and then you can tell me about these … monsters."

He started to renter the TARDIS but Annabeth put a hand on his arm. "Oh, no, you are not going in there alone! I'm coming with you so you don't escape." The Doctor merely shrugged and they both entered the ship.

Percy was about to protest that there wasn't enough room in that little box for both of them but the door was already closed. About three seconds later, Percy heard a gasp and a muffled exclamation. It took all his will power not to burst in after her but Percy knew that Annabeth could take care of herself. After three minutes, he was starting to wear a path in the ground from his pacing. At five minutes, he was just about to call up all the water near him and use it to bust the door of this "TARDIS" down. Fortunately, Annabeth and the Doctor returned at that moment, Annabeth's eyes wide with excitement and the Doctor holding something that looked like a block with a colander on top.

"Percy – it's bigger on the inside! It's huge in there – and he's got a pool!"

Percy just stared at her and then looked to the Doctor, who was grinning hugely at Annabeth's excitement.

"So, where is the center of your camp?" the Doctor asked. "This teleportation-blocking-thingy needs to be in the exact center of the camp." As Percy led him to the center of camp, he explained why, going on about "scrambling electrons" and "reversing photon polarity" while they were in the "critical quantum stage". Annabeth soaked up every word he said, but Percy (who was not jealous) was getting a little tired of "the Doctor" and so, he let Annabeth take over as the Doctor's guide and walked off into the forest.

Annabeth and the Doctor reached the center of camp and after about five minutes of fiddling, piddling, and "sonicing", the Doctor pronounced his "teleportation-blocking-thingy" ready. "It should activate as soon as I dematerialize in my TARDIS. Now, about these monsters, do-" he began.

"Exterminate!" The Doctor paled and spun towards where that word had just come from, searching for its source, which was hidden in the trees.

"No – no! How can they be back again?" he moaned in despair. Then, taking command of the situation as always, he turned to Annabeth who was already drawling her knife and said urgently, "Listen to me – you can't fight this with human weapons. You need to hide – the thing that made that sound is called a Dalek and it will slaughter all of you. The only reason you're still alive is because it hasn't found you yet."

He spoke too soon. Just then, the Dalek glided out of the trees. The Doctor glanced at Annabeth and saw her thoughts written clearly on her face. He wants me to hide from a saltshaker? Nevertheless, she did hide, mostly because his ship was bigger on the inside so he must know what he was talking about.

Plans ran through the Doctor's head as he tried to figure out how to save the camp from the Dalek, but he was interrupted by Percy Jackson running out of the woods and right towards the Dalek, sword in hand.

"Percy!" Annabeth shouted, horrified. "Don't! STOP!" But of course, he didn't listen.

They never listen, the Doctor thought bitterly as he jumped up and chased after the boy in a fruitless attempt to save Percy's life.

But Percy's life didn't need saving. Instead of being exterminated, Percy dodged the Dalek's bolt and sliced the Dalek with his sword. And the sword, instead of bouncing off the Dalek, went through it causing the Dalek to exploded into golden dust.

"What? What?" the Doctor exclaimed incredulously. "But, how – what?"

Annabeth glanced at Percy, who was strutting back towards them, and grinned. "That's celestial bronze – not a human weapon."

"But – you killed it! How?"

"Oh, no. It's not dead," Percy exclaimed. "Just banished to Tartarus. Celestial bronze'll banish any monster (and that was definitely a monster), if you're lucky, for years. If you're not, only for weeks. But ..." Percy looked confused. "I thought you knew what those things are. Didn't you know that they don't die?"

"They don't die?" the Doctor repeated dazed. "You mean you can completely destroy their entire race again and again and they'll just keep coming back?"

"Yeah, but-"

"That's brilliant – just brilliant," the Doctor said bitterly.

"But, Doctor," Annabeth protested, "I thought you had a course in 'Demigods 101'. Didn't they cover monsters and Tartarus?"

The Doctor looked rather sheepish. "Well, when I say course, I really mean lesson. Well, it was more of a conversation. Well, actually, Odysseus and I were running away from an angry Aphrodite and he shouted a few sentences about the existence of gods and demigods and how, unless Aphrodite fades, I should avoid her because she holds a grudge against me. Of course, if I hadn't- well, anyway, I didn't think there was much more I needed to know about demigods, but apparently I was wrong ..."

Percy laughed. "Well, Doctor, I think we could teach you a thing or two, and I know you could teach us some things."

"Um, sorry. But I can't. I have to … um … talk to Raxacoricofallapatorian about an … um … Ubersoldaten … It was absolutely brilliant to meet you all!" And with that, the Doctor began to walk away, muttering about stupid unbeatable Daleks.

"Wait!" Annabeth called after him. "Chiron will want to talk to you!"

The Doctor didn't come back. He just waved as he stepped into his TARDIS. A few seconds later, the TARDIS dematerialized.

Just then, Chiron galloped up. "What happened? I heard shouting."

Annabeth continued to stare at where the TARDIS had just been and said just two words, "The Doctor."

"Ah," breathed Chiron. "That explains everything."

A/N: So, what'd ya think about my theory of why Daleks never die? Let me know! Update: Due to popular demand, this one shot has been continued. So, read on!