"Duck!"

Donna chose to ignore him, leaping out of the way instead. That proved to be a good choice, with the Dalek's shot barely missing her.

"The doctor must be EXTERMINATED," repeated the Dalek in his monotonous tone. "EXTERMI-"

Before the Dalek could finish, a flash of red light shot into the Dalek. The doctor jumped, and tackled a terrified Rory into safety. And just in time too, as an ear-splitting explosion followed.

Debris shot everywhere. The doctor covered Rory's face with one arm and used the other to cover his own.

After the ringing in their ears had stopped, the doctor and Donna stood up and started to dust themselves off.

"Where's Rory?"

Right on cue, Rory popped up from a pile of golden dust. "That was brilliant!" Exclaimed Rory, his face covered in soot.

"Yes, it was, but what happened?" He looked at Donna. "Donna? Got something to tell us?"

"The Sontarans had those laser beam thingies, how could I resist?"

"Donna, you know that's a bad idea..."

"Everything I do with you is a bad idea, so shut it. And it doesn't mater anyway. It split in two during the explosion."

The doctor looked down at the debris. "Well, it's a good thing you did it. You saved my life."

"And my own."

"And mine!" piped Rory.

"Well, that doesn't matter now. Where did that Dalek come from? Rory, what happened to you? Tell me everything."

Rory obeyed, giving the doctor every tiny detail about the whole escapade.

"So, your Legos must have been Dalekanium, maybe even Metalert, if the Daleks really wanted to revive themselves. But why you? There are so many children in the world who could build with Legos, so why you? What's your name?"

"Rory Williams."

"I've never heard of you."

Rory frowned. "Why would you? I'm only eight."

"I've been around a long time."

"So? I've only been eight or younger my whole life. That's how time works."

The doctor laughed. "That's not in the least bit true. Back to business. So, based on what you're telling me, these things can morph. Into Lego creations, but really good ones, better than you could have possibly made."

"Hey!"

"Sorry, but it's true. No child could make that, or any person, really."

Rory considered this. "Yeah, I guess you're right."

"Anyway, the Daleks must have influenced you. To make more of themselves. But why with toys? Why with-" Donna cut him off.

"Because," she said, "of that."

The doctor looked to where she was pointing.

Hundreds, no, thousands, of Rory's creations lay on the ground. Animals, fruits, buildings, all of them exact replicas.

"These could all be Daleks. Look how many there are," continued Donna.

"I know," said the doctor, "but since the Cult of Skaro is probably doing this, and since they must want to double there number, that must mean that there are only-"

"Three. Caan, Jast, Thay and Sek. But we just killed Jast."

"Rory? How did you know that?" the astounded doctor asked.

"How did I know what?"

"How did you know about the Cult of Skaro? And how did you know it was Jast that died?"

"What are you talking about?"

"Um… nothing. Don't worry about it." Donna and the Doctor looked at each other. "Anyways, we'll have to destroy all of this."

"What? Why? I made this! I could sell it to a museum!" Protested Rory.

"What? A museum for Legos?" laughed Donna.

"Donna," reminded the doctor.

"Sorry."

"We have to destroy all this, but how?"

"With a bomb," offered Rory.

"A bomb won't work, these are Daleks we're talking about. It would have to be practically a nuke. Or a-"

"Or a what?"

"Or a Dalekanium bomb."

"That's what you said the Daleks are made of," Donna said.

"Right. We just need a lot of it. Rory, do you have any more of those Legos?"

"Yeah, I've got a bucketful."

"Perfect."

…

"Doctor, if you think I'm gonna carry one more freaking box of Legos, then you have never been so wrong."

"Donna, what do you mean, 'one more'? You haven't picked one up yet. And anyway, Rory and I are almost done."

They had piled up hundreds of the Dalekanium Legos into the TARDIS. They had been at it for an hour and a half, and still had a good hundred pounds to go.

"Where have you been putting those blocks, anyway?"

"In my TARDIS, Donna. Have you really not been paying any attention?"

"Where in the TARDIS, I mean. And don't get sassy with me."

"In the garage." The doctor found it best not to argue with Donna, considering they already had the Doctor's greatest enemy piled up in the last TARDIS in existence.

"You have a garage?"

"Yes, I have a motorcycle in it. I haven't used it though. I should take someone for a ride someday."

Thirty minutes passed by, and finally the Doctor and Rory had all the Dalekanium in the TARDIS.

"Doctor?"

"Yes, Rory?"

"If we had all that Dalekanium, how did it fit in my room?"

"Timelord science. The Daleks have been stealing timelord technology. The box they were in was bigger on the inside. Now, Rory, I don't know how to make a Dalekanium bomb. But you do."

"I do?"

"Yes. The Daleks transferred their intelligence into your mind. You have a blueprint in your brain. Can you find it?"

Rory sat for a moment in deep thought. He suddenly smiled. "Got it." He left the room, headed towards the garage.

"Alright," the doctor said. "All we need now is to drop it off. Pick a year."

"1986," replied Donna. "Why?"

"So we can pick a random date, that way if something goes wrong, we can go back and not create a paradox. What are the first three digits of your number?"

"264."

"264, that's April 26, 1986. And where? Remember, pick randomly. Don't put any thought into it."

"Ukraine."

"Why Ukraine?"

"I don't know."

"Perfect."

…

"BOMB READY?" The doctor yelled over the wind. It was blowing very loudly, which was normal, considering the TARDIS was flying at almost 250 kilometers an hour.

"YES!"

"DROP!" The doctor pulled a lever as he said it, opening the garage. Hundreds upon hundreds of pounds of Legos flew out of the open door, landing on the grassy ground. The bomb rolled out on top of them.

"CLOSE THE DOOR!"

Donna pulled the door shut, calming the wind noise.

"Cover your ears. Now."

Just then, an ear- ripping explosion shot through the TARDIS, sending it careening backwards through the Ukrainian grassland.

After several minutes, the noise stopped. The doctor had a bad look on his face.

"Doctor? You alright?"

"No, Donna. That explosion was way too loud. And I just realized- we're in 1986."

"Why? What happens in 1986? Oh…"

"Yeah, oh. Chernobyl happens. We just made Chernobyl happen."

"But we can go back in time and fix it, right? Since it was a random date?"

"No. That explosion is a fixed moment in time. Nothing we can do now. But we do have to do something about Rory."

Rory lay unconscious on the floor.

"He's fine, but we can't have someone with his knowledge running around. We have to wipe his mind of the past few days."

The doctor hooked him up to a large machine. It had an extraordinary number of red dials and buttons across it's worn copper green front, with a large cord that attached to a headpiece.

"We'll just push this button and-"

BOOM!

"Doctor? Doctor, what happened?" Demanded Donna.

"We've created a paradox. Rory must grow up to be someone, who comes back in time and tells his past self about me. He must be my companion later on." Donna gulped at that remark. "But it hasn't spread to the TARDIS. It's contained inside him. But he can't contain that, he will have to drop bits of paradox everywhere he goes. Whoever he grows up to be, that person will be creating rips in spacetime without even knowing it."

"So if he's spreading it.."

"Right, let's get him out of here."

…

Donna laid down Rory into his bed. He started to move.

"Quick, get into the TARDIS. If he sees you, he may explode with paradox."

Donna quickly hurried into the TARDIS. The doctor was already busy pulling levers and dialing buttons.

"So, where to next?"