The TARDIS materialized in the middle of a long, narrow passage. Out stepped an enthusiastic young man with short dark hair and a bow tie.

"Alright," he said. "Welcome to Antarctica. Rory, Amy, you two are about to see something incredible."

"Yeah," said Amy stepping out of the TARDIS. "Snow, like we couldn't find that at home."

"Oh no," said the Doctor. "There's way more to it than that. Wait until you see what lies beneath. You'll love i-"

"Doctor," Rory interrupted. "What's that noise?"

The Doctor paused for a moment, hearing a loud shrieking sound. He quickly ran down the corridor and found what looked like a dog kennel, but inside was certainly not a dog. It looked like some kind of monster with a vaguely dog-like head.

"Oh no," said the Doctor. "This is bad. Really, really bad."

"What is it Doctor?" Rory asked.

"It's a creature from the other end of the universe," replied the Doctor. "It copies the cells of other life forms, creates perfect imitations, and then spreads."

"You mean, it's trying to imitate a dog," asked Amy.

"Multiple dogs by the look of it," replied the Doctor. "I think we got to warn the owners. AMY! RORY! STAY HERE AND DON'T DO ANYTHING UNTIL I GET BACK!"

Poole lay in bed, trying to fall asleep. The memory of everything that happened that day kept playing in his head. One moment he was playing chess with HAL, the next he was in a wooden shack belonging to a missing helicopter pilot. Suddenly there was a knock at the door. Poole ignored it for a moment before pushing his bed sheets aside and walked over to the door.

He expected to find the authority figure or one of the Americans waiting there. Maybe Blair or Fuchs had found something interesting. What he did not expect was to see an enthusiastic young man with short dark hair and a bow tie, which is exactly who was standing at his door.

"Oh hello," he said excitedly. "I'm terribly sorry to disturb you. Are you in charge here?"

"No," replied Poole.

"Ah," replied the strange man. "Well, I just thought you might want to know that a strange shape shifting alien is in your dog kennel. "

Poole quickly stepped outside and followed the strange man. He led him right into the dog kennel, and Poole could not quite grasp what he was seeing."

"Anything happened while I was gone?" asked the Doctor.

"Not that we could see," replied Amy.

"Right," said the Doctor. "The only way to kill one of those creatures is to burn it."

He turned towards Poole. "Do you have anything. Some flares maybe? A flamethrower? Something that creates fire."

Poole just looked at him confusedly. "I don't know," he shouted. "I'm not even supposed to be here."

"Well we got to do something quick!" The Doctor shouted. "Let's see. There's got to be a fire alarm somewhere."

At that point, the large man with the thick beard and the green hat stepped through a door and walked up to them. "What the **** is going on?" he asked.

"I'm not sure," replied Poole. The man walked up to the Doctor. "Who the **** are you?" he asked.

"Me? I'm the Doctor," replied the Doctor keenly. "Are these your dogs?"

"Yes," replied the large man. "What's happening."

"There's something in there," replied the Doctor. "Something dangerous, something evil. Something like you've never seen before."

"What is it?" asked the large man.

"It's a shape-shifting life-form," replied the Doctor. "It survives by copying other life forms."

"What do we do?" asked the large man.

"Find a fire alarm," said the Doctor.

"Fire alarm?" asked the large man.

"I'm guessing you're here with some other people are you not?" replied the Doctor. "I need a way to quickly alert them."

The large man quickly ran down the corridor. After a moment, the alarm rang throughout the base and it was not long before the team joined them.

"I don't know what's in there, but it's weird and pissed off whatever it is," said the large man as everyone showed up.

"Alright," said the Doctor. "I need someone to get something to burn it with."

Bennings quickly ran off. He came back a few minutes later with the bald black man. He had a flamethrower, aimed it towards the creature and fired.

As soon as the fires were put out, things started to calm down and everyone turned towards the Doctor.

The Doctor took a breath before he started talking. "Right, now this is very important," he said. "How did that creature get into here? Does anyone know?"

"There were a couple of Norwegians this morning," said the authority figure. "They were shooting at a dog and then it ran into our bas-"

"And you let it in because you felt bad for it," said the Doctor. One by one the men started to leave while the Doctor kept thinking.

"We got to it before it time to finish imitating the dogs," he said. "The question is whether or not it infected any of the people."

The Doctor suddenly walked towards Poole. "You," he said. "I'm sorry, didn't catch your name."

"Frank Poole."

"Frank Poole," said the Doctor, thinking about it. "Frank Poole, Frank Poole, Frank Poole. Why does that name ring a bell? I don't know. Anyway, what exactly did you mean when you said you weren't supposed to be here."

"Well," replied Poole. "Earlier today I was on a spaceship playing chess with a computer. Next thing I know I'm in some shack in the middle of Antarctica."

The Doctor thought about it for a moment. "OF COURSE!" he shouted. "THE DISCOVERY MISSION TO JUPITER!"

"Yeah," replied Poole.

"I remember now," said the Doctor. "I visited that ship before when I was younger, and there was a crewman missing. Can you show me the place where you inexplicably turned up?"

"Sure," replied Poole.

"Doctor," said Amy. "What about that creature?"

"Keep an eye on it," said the Doctor. "I don't want that thing getting out. Frank, I'm going to have to ask you to find that shack."