"Aha!" The Doctor exclaimed triumphantly. He had been crouching by a strange, makeshift machine, that he hoped would eradicate the problem.
"Have you finished it?" Herbreas asked. The leader of the wasp-humans had moved around the chamber, sometimes others would come in.
"Yes," the Doctor replied, "Well, I hope so anyway."
"Are you sure it will work?"
"It has to, because I don't see any other way of getting rid of it, and I want my friends safe."
"What does it do?"
"A lot of things, I think. One is a surface detector, I can see how far away they are."
"How?"
The Doctor grinned and stood up. He got out his sonic and pointed it at the makeshift machine. Soon, it started beeping. Four, rhythmic beats. Beep, beep, beep, beep. Beep, beep, beep, beep. The rhythm sounded scarily familiar, but he needed to solve the original problem first. He looked at one of the small screens of the machine. There were four dots; three were very close together. They weren't far from the underground place he was in. The Doctor grinned, the other dot was rather far away. However, his smile faded as the fourth dot suddenly started to move incredibly fast. It was almost impossible. "No, no. That's not good. Oh, that was rather unexpected and very, very bad," he muttered to himself
"What?" Herbreas asked.
The Doctor turned to the wasp-human. "Whatever the beast is, I think it's coming for my friends."
"Are you able to contact them?"
"I might be able to."
"Then, if they are so important to you, do it."
"I would have done so anyway!" He grinned, and activated his sonic again.

Run. The three letter word appeared on River's device. River frowned as she pondered about it. Her husband was insane and clever, and she didn't know whether following his word was beneficial or not. "River, are you alright?" Chloe asked as her and Jack noticed the woman hadn't been keeping up with them. River looked up at her. "Yes, of course," she replied, "We need to be careful."
"That basically sums up life with the Doctor. You always need to be careful," Jack said.
There suddenly was an almost mechanical hissing from near them. They looked around, and River was the first one to notice what it was. Run. Of course. "I think we need to run," she said, "and do so very fast." Jack and Chloe knew better than to argue – that was that sort of life. "What is it?" Chloe asked as they ran as fast as they could, away from the creature. "I don't know, but I'm certain it's not friendly," River answered.
"By the way, how did you get here?"
"Does it matter?"
"Yes!"
"Vortex manipulator."
"Does that require co-ordinates or something like that?"
"It needs a base code," Jack answered.
"How do you know that?"
"I have one, but it's kind of broken."
"Right." Chloe managed to get out her sonic and made it whirr. Moments later, it made a strange little noise – it sounded like something between a whirr and a ding. "Jack!"
Jack managed to catch it perfectly as Chloe threw it to him, and then gave it back to her. They had slowed down by now. They had thought they had run enough to get away from the sinister sounding creature.
"What's the base code?" River asked.
"Seven and three," Jack replied.
They once again heard the mechanical hissing, louder this time. They turned around and it was getting closer by the second.
"River, go," Chloe demanded, her eyes fixed on the creature. It was as black as day, and its shape kept changing.
"Do you really think I'm leaving you two here?!" River said.
"Chloe, don't be too rash," Jack said, grabbed her hand and put both of theirs on River's as the creature advanced, "River."
"What's meant to happen?"
"My vortex manipulator doesn't work without the help of a sonic device, I'm guessing yours doesn't need it, now hurry up!"
River sighed and pressed a button on her vortex manipulator. They disappeared into thin air, just in time, as the strange creature would have jumped onto them and killed them if they had taken one second longer.