The strange pony began to slowly move. Black tentacles grew from his back. In one of them was a letter. He laid it at The Doctor's feet, then backed away and bowed his head.
The letter said,
"Welcome, my guests. I assure you that I mean you no harm. Please do not panic. I have no name, yet I have been called many things over the eons. The Tall One, The Slender Colt, Slendermane, Der Grobmann, The Operator. You may call me what you wish. I have brought you all here for a purpose. I would like to play a game with you. You are all broken, and I would like to help fix you. The game shall begin when all of the players have assembled. Do you have any questions?"
The Slender Pony looked at a wall to his right. Suddenly, the wall disappeared, revealing an Earth Pony in a lab coat, who appeared to have been beating on the wall for a while.