"Dude, I'm telling you Geralt could easily kick a Xenomorph's ass!" Dean said overly enthusiastic as he and Sam entered the Bunker.

Sam huffed rolling his eyes at Dean as he tossed his duffel bag onto a nearby table, shaking his head at his brother's ridiculous thought.

"Whatever you say Dean... I'm gonna go wash up, I can still smell sewer on me," Sam sighed a bit loudly.

He gestured to himself, his shirt and pants covered in who-knows-what. Dean made a face at his brother, pinching his nose.

"Yeah, you go do that," Dean plopped himself down in a chair, shrugging off his jacket and tossing it onto the table.

"I'll order us some pizza!" Dean called after Sam as he walked off to make his way to the showers. Dean kicked his feet up onto the table, pulling out his cellphone.

Alarms starting blaring throughout the Bunker, red lights flashing above the doorways and launching Dean out of his seat, gun drawn.

Sam came running back in, drawing his gun as he whipped his head around looking for whatever set off the alarm system when a loud crash from somewhere in the distance drew their attention.

"What the hell is it now?" Dean snapped following Sam down a corridor in the direction of the noise they'd heard. Sam shook his head in response, just as concerned as Dean.

They rushed into the library just in time to see a strange woman standing in a pile of books scattered all over the floor, Dean and Sam both aiming their guns at her.

The woman was a bit shorter than either of the brothers, short blonde hair reaching her shoulders and wearing a black top, tight jeans and leather boots.

She spun around, a knife in one hand raised defensively as she faced Sam and Dean, a wild look in her eyes as she stared them down.

"Who the hell are you?" Dean demanded taking a step towards the woman, she swung her knife at him but Dean managed to dodge out of the way in time.

"I could ask you two the same," she responded narrowing her eyes on Dean and Sam, pointing at one then the other with her blade.

"You first, blondie..." Dean smirked, waving the barrel of his gun in the woman's direction with a sideways glance at Sam, who threw him his signature bitch face.

Buffy glanced around at the spacious library she was in, eyes scanning the books scattered around her and furrowed her brow when something clicked in her head.

She noticed most of the books were bound in leather and looked similar to ones she'd seen in Giles' private collection, which surprised her.

"Where am I?" she asked quickly turning her attention back towards the men pointing guns at her, slowly lowering the knife in her hand.

"Answer our question first, then we'll answer yours," Sam responded cautiously lowering his gun, pointing it towards the ground but not putting it away.

"Buffy... Summers," she answered without hesitation, figuring the men would no doubt recognize the name, she was The Slayer after all.

"Who?" Dean and Sam said in unison sharing twin expressions of confusion, glancing at each other then at the woman.

"Do the words 'The Slayer' ring any bells?" Buffy looked at them equally confused, a touch of bewilderment in her voice.

"Not really, no..." Dean remarked truthfully, tucking his gun back into the waistband of his jeans as he kept his eyes on her.

"Slayer, as in 'she alone will wield the strength and skill to kill the vampires, demons and the forces of darkness'..."

Buffy huffed moving to walk past Sam and Dean, plopping herself into a chair at a table behind them.

Dean and Sam turned around to watch her, sharing a look before moving to sit down at the table with her.

"Let me ask you this, ever heard of hunters?" Dean inquired looking at her with a raised eyebrow, Buffy simply shook her head in reply.

"I think right now our biggest question is how she ended up in the Bunker, Dean..." Sam spoke up looking between his brother and Buffy.

"Where did you come from, exactly?" Sam asked turning his full attention on Buffy, his brow furrowed.

"Sunnydale, California... Where am I now?" Buffy responded giving Sam an equal look of confusion.

"Lebanon, Kansas..." Dean replied staring at Buffy, utterly confused. How did someone from California end up in Kansas, in their Bunker of all places.

"Maybe we should call Cas?" Sam added when Dean continued to simply stare Buffy down, only looking up at the mention of Cas' name.

"See if he can zap her back to where she belongs?... Sounds like a plan, Sammy," Dean finally answered after a long second.

"Cas, we got a bit of a situation here and could use your help... Please!" Dean spoke aloud, looking around as if waiting for something.

The sound of wind and rustling wings caught their attention as Castiel appeared a few feet behind where Buffy sat.

"I came as fast as I could, Dean," Castiel spoke looking around at Dean and Sam before turning his attention on Buffy, his brow furrowed in confusion.

Buffy turned around in her chair, hand instinctively going for her blade as she jumped out of her seat knife raised above her head.

"Drop it!" Dean barked already out of his chair with his gun aimed at the back of Buffy's head, cocking back the hammer.

"Fine, chill out..." Buffy quipped throwing her hands up in the air, dropping the blade to the floor with a loud clatter that echoed around them.

"Hey Cas, this is Buffy... She's a little lost, think you could return her to where she came from?" Dean explained as he moved to stand next to Castiel.

Castiel placed his fingers against Buffy's forehead, focusing on sending her back home when suddenly nothing happened.

"Do I even wanna know what that was about?" Buffy questioned looking between Dean and the man he called Cas.

"She isn't from this time... You don't belong here," Castiel spoke in a low voice, staring intently at Buffy.

"The hell is that supposed to mean, pal?" Buffy snapped rising to her feet from the chair, eyeing Castiel like she was sizing him up.

"What year is it?" Dean questioned stepping in between Castiel and Buffy, putting his hands up defensively.

"Two-thousand and three, why?" Buffy responded, confusion screwing up her face when Dean and Castiel looked at her in surprise.

"It's twenty-fifteen... You're more than just lost, you got tossed here into the future," Dean explained, turning from Buffy and Castiel to Sam.

"You're being serious?" Buffy asked looking at all three men sharing looks between each other. Dean nodded in reply.