Disclaimer: Joss Whedon and Mutant Enemy own Buffy the Vampire Slayer and all characters associated with it. I unfortunately am neither so only the ideas contained in this story belong to me.
Chapter 0: Let Slip The Dog of War
A figure stood shrouded in the shadow of the dead end alley, only the shine of his steel toed boots visible in the wan moonlight. Further towards the mouth of the alley a light began to glow in mid-air. As the glow intensified, it bled an arterial shade of red and warped the air around it, before blazing like the heart of a corona and blinking out of existence.
When the alley clears a man now stands glaring at the shadowed figure. His feet bare revealing claws where toenails should be, a pair of torn and battered jeans his only vestige of clothing apart from an old black windswept cloak hanging off of a shoulder, showcasing a scared and muscular torso. The hood of his cloak conceals his face, except for a few strands of hair that fall beyond its range. At a nod of the figures head the man turns and looks at the scene behind him. Across from the alley stands a warehouse, four men stand guard before it. A low growl is torn from his throat as he smells them; vampires 'where there's one leech, there's more.'
The cloaked man walks towards the warehouse drawing the attention of its guards. One of the guards steps towards him, "Hey! This is..."
The guard looked down to see an arm sticking through his torso, eyes flicking back up before he turns to dust. Before the vampires remains hit the floor the man's already charging the stunned remaining guards.
*Back in the alley*
The shadowed figure watches as the cloaked man rips through the vampiric guards with bestial efficiency. The figure turns and walks into the shadows, fading with each step.
The whispered words "Cry havoc and let slip the dog of war." fill the alley before the figure completely vanishes.
Chapter 0 End
This is the first chapter second draft. May change it in the future, PLEASE review and let me know if it's any good.