The slender one.

"Why is it that everytime he comes around, everything gets messed up, weird and disturbing?! This is the fourth time I'm supposed to stop him and it's just as weird! And you two aren't helping!" The Doctor said while pointing at Slenderman, who was still holding an unconcious Luna. Slenderman looked from the princess to him and then placed her down, rubbing the back of his head sheepishly.

"But now I at least know why you and The Rake are here." He walked towards the blue alicorn and poked her with his hoof, waking her up.

"Foul beast! Thou shall... Oh! Hello Doctor! It's been a long time!" Luna's expression went from one filled with rage to one of genuine surprise.

"Yes it was. Now I need you to stop fighting Slenderman and get Celestia over here A.S.A.P." The look on his face was one of worry, anger and annoyance.

"But why?"

"It's easier to explain when Celestia is here. I'll tell you this: He is back."

"You mean... Of course. We shall get our sister." She quickly left, limping a bit thanks to her injuries.

"And you, how many have you killed in this land already?" He asked Slenderman. The tall man grabbed a piece of paper and a pen and wrote something down. His face was almost the same as it was before he went into full rage.

"Twenty."

"Meh, could be worse. Now, get your little friend and get inside the Tardis. This is important." Slenderman nodded and left to get the blue filly.

"I hope I can stop him again this time."

Meanwhile, in an unknown part of space...

"I should have stopped him. I should have ripped his head off. I'll show that Slenderman not to mess with Luna, and how much I enjoyed seeing him suffer, I shouldn't forget about Leech. He's about to make tons of lifes suffer. I think it's time to send the boys out." A man said, his voice filled with anger.

Draw the lines, through the signs.

Cut the man, that's the plan. Is what Twilight heard first when she woke up.

'Why am I still alive?' She though to herself. She tried to get up, but couldn't feel her legs. In fact, she couldn't even feel her body. She opened her eyes and saw Leech cutting up a body. The looked a lot like a hairless monkey with clothes. And there was an unsettling amount of blood covering the body.

"Why am I still alive?" The purple mare asked. Leech turned around with his torso covered in blood and a mad grin on his face.

It was about time you woke up. I had to amuse myself with one of those worthless humans. He picked up the body and flung it across the room, it's innards falling out before being devoured by horrible spiders.

And my answer is: magic. Duh. It should be quite obvious. He wiped the blood from his torso and walked towards her.

"But why can't I feel my body?"

**What, you haven't figured it out yet?** He broke out in insane laughter, making the hairs on her neck stand up.

"What do you mean?" She started to suspect what he meant, but didn't want to believe it.

It's quite simple. You don't have a body anymore. He started laughing again, while Twilight's mind started catching up.

"But, t-that's impossible! How?!" She yelled.

I used one of my favorite kind of magic: necromancy.

"But why?!"

This is the part where it get's confusing. You know that little voice in the back of your head, telling you what's wrong and what's right? He said while walking around her, like a predator stalking his prey.

"You mean your conscience." She stated matter of factly.

Exactly! But I don't have that! And that's why that pesky Doctor stops me everytime! Because I don't know when to stop! At this ponint he was furiously waving his arms around. Then he stopped and quickly picked her up, holding her in front of his face. But now I have the solution. You.

"M-me?" She didn't like the look in his eyes.

Yes, you. I have added a few extra spells to your mind, making you act as my conscience. It works as a reflex. Everytime I go too far or I do something that isn't neccesary, you instantly tell me that it's wrong, making me stop. His grip on her loosened a bit.

"B-but, why did you have to take my body away?"

Because it was in the way.

'And now the most important question.' She thought. "Why me?" In response he held her left ear close to his mouth.

I have always liked dark colored hair. He then attached a chain to her neck and hung her around his torso like a purse.

"And what are you- I mean, we going to now?" She knew that she was losing it. How else would she accept being a bodylles head used as conscience? 'He must have done something else with my mind too.

First of all: let me explain a few things. I am Leech, the spirit of corruption and agony. I am chosen to balance the purity and happiness in the ponies hearts out. But without a conscience I'd bring destruction to this world. Corruption is just as neccesary as love and laughter, you know.

"I don't think I undertsand."

Let me ask you a question. Is corruption evil?

"Of course it is! Why wouldn't it be?" She pointed out.

WRONG! She was taken back from the sudden outburst.

Why is it so hard for all of you to understand?! Everything has an opposite, or it cannot exist! If there was no evil, how can there be good? If there was no disharmony, how can there be harmony? If there was no darkness, how can there be light? It's as simple as that! What he said actually made sense to her.

"You're right. Everything needs an opposite, or there is no balance. You are only doing this because it's neccesary."

Finally! Someone gets it! Sadly, this world is almost devoid of corruption. And death is also a form of corruption. A higly corruptive one at that. And that's why I kill. To speed it up. So here is my question: are you ready? There was no joy in his voice. While they were talking he had walked towards the entrance of the cave.

"It's not like I have a choice, or do I?" She glanced at his face. There formed a small grin (small for him) on his face.

No, no you don't. Now let's get this show on the road. Equestria, here we come! He walked out of the cave and made his way towards the closest village.

"*sigh* Let's get this over with." She knew this was going to get ugly. But she could better just work with him. What else was she supposed to do? What else could she do?

"-and that's what I know up to this point." The Doctor finished. He had been explaining things for the past thirty minutes. In front of him were the princesses, Slenderman and Blue Breeze, Spike and the mane six, excluding Twilight.

"But how are we going to get Twilight back?" Rainbow asked, visibly worried. And she wasn't the only one. Everpony in the room (okay, probably not Slenderman and Blue Breeze) was worried about her.

"I'm afraid it's too late for that. He has probably killed her by now." He immediatly regretted those words. That was NOT what they wanted to hear.

"B-but we can think about that later! Right now we need to stop Leech from corrupting Equestria. He'll most likely want to do it fast, and the fastest way is by murder. We need to warn everyone in Equestria and we need to ensure everyones safety." He hoped that he could convince to work first and mourn late.

"But what about Twilight?" Pinkie asked. She was clearly about to burst into tears and her mane was a bit deflated.

"I don't know for sure. But there is a chance she's still alive."

"Oh. Okay."

"Okay. And now... Do you smell smoke?"