Steve, the player of Minecraft, was mining when sssssssssssssssssSsssssssssssssssssssssssssssSssssss ... BOOM! Steve was dead. But he respawned, and when he did it, he was different. His flesh was rotten, he had changed. But most importantly, he had no brains. Now Steve was a zombie. But him, the master of all the evil mobs ... yes, you guessed it. HEROBRINE appeared.
HEY, YOU! FINALLY! Soon I will have an army of undead! - He said.
Steve the zombie smelled Herobrine brains, and chased him for endless days until Herobrine decided to create a new monster to serve as company for the zombies: the skeleton.