Disclaimer: I own neither supernatural or Ghostbusters

So I was watching Ghostbusters and I thought "Wouldn't a Supernatural Ghostbusters AU be freaking amazing!" so this was written.


Chapter 1

Dean really had to say, he loved his job. Being one of the professors of parapsychology at Columbia University was awesome. He got to work with his two favourite people in the world, Sam his younger brother and his best friend Castiel, and all he had to do was a study or two a year.

Like right now. It was a study on how the use of negative reinforcement of a mild electrical shock could increase the levels of ESP in some people. Or at least it had been, until one of his participants had exercised his Right to Withdraw by withdrawing from the room.

At least he still had one participant, Lisa Braeden a literature student who had absolutely no psychic abilities whatsoever, not that Dean had told her that.

"Do you really think I could be psychic, Dr Winchester?" she asked looking up with wide eyes full of wonder at the professor across from her.

"Well, Ms Braeden, I gotta say, no one has ever guessed that many cards correctly in the five years I have been working at this university. I think you have a real natural talent." He lied, watching as her smile managed to grow impossibly wider. "In fact, I think with some nurturing this talent of yours, it could be something brilliant."

Lisa opened her mouth to say something but was interrupted by the door banging open and Sammy running in yelling "Dean!"

Dean's protective older brother instincts flared up and he stood "Sammy? What's wrong?"

"Dean, you got to come with me to the Central Library right now!" Sammy had long brown hair that curled down past his ears and he towered over his brother and everybody else in the world. He was wearing a familiar plaid shirt and old blue jeans.

"Excuse me a moment," he said to Lisa and pulled Sam into a remote corner with him and said "Sammy, I'm kinda in the middle of something here!" gesturing towards Lisa.

"I'm sorry, Dean, but we found an actual ghost!" He said, his face lit with an excited smile. "This afternoon ten people at the New York Public Library saw a Free Floating Full Torso Vaporous Apparition throwing books off shelves and scared a librarian half to death!"

"Well, that's great Sammy!" Dean crowed slapping his brother's shoulder affectionately "You and Cas need to go down there, get some data and come show me, okay?" He started to walk back over to Lisa when Sam grabbed his arm stopping him in his tracks.

"No, Dean, you gotta come with us, Cas is already down there taking EMF readings and their off the charts! This is the big one Dean! We're going to make history!" He nailed Dean with his large soulful puppy dog eyes that had never failed at making Dean give Sam whatever he wanted.

"Alright." Dean grumbled "But this better not turn out to be some whacked out Schizophrenic who's off their meds again."

"Dean, that was one time!" Sam protested.

"Yeah, yeah. Sorry about this Ms Braeden, we're gonna have to take a rain check but how about we meet up for dinner tonight, say about…"

"Eight?"

"That is exactly what I was about to say!" He heartily ignored the way Sammy rolled his eyes beside them as he ushered Lisa out of the room before them and they started to walk out of building.

"Seriously, Dean? She's a student!" He complained shaking his head in disgust as they climbed into Dean's car, a 1967 Impala that was previously owned by their dad.

"Not my student." He pointed out as he started the car and slid a Led Zeppelin CD into the player.

"So not the point Dean." He murmured but couldn't comment further as Dean turned the music up to an eardrum damaging level a clear sign that the conversation was over.


Sam and Dean jogged up the libraries steps and hurried inside. They found Cas knelt down by a table near the entrance, a stethoscope plugged into his ears and pressed to a table.

"What the hell is your boyfriend doing?" Dean asked watching Cas shift the listening piece across the table with a look of intense concentration on his face.

"Shut up, Dean, he's not my boyfriend." Sam protested blushing slightly and tapping Cas's shoulder to get his attention. Dean just grinned, Sammy had been pretty much been in love with Cas since he'd met the guy at college, years before. Dean had never been able to work out how they had never gotten together.

"Hello Dean, Sam." Cas said standing up straight. Cas was almost the polar opposite of the two brothers. He was shorter than them both and also had a much less muscled frame. He also had a wide spread of stubble across his lower jaw while the two boys preferred to be clean shaven and fluffy brown hair that was often messy. A fawn coloured trench coat hung over his wiry frame and gave him the overall appearance of a tax accountant. "Sam, why are you blushing?"

"I, er, how about we go talk to the librarian now?" He deflected and quickly walked towards an office. Dean hid a grin and sauntered after him with Cas who was looking confused as usual.

Dean really couldn't work out how Cas had not realised that Sam was head over heels in love with him yet, considering that it had been going on pretty much since they'd met each other but then Cas was socially inept and tended to be confused by social cues that most people understood instinctively.

They finally caught up with Sam as he entered a small office where the librarian, a pretty young woman with black hair, was lying on a wooden desk with a coat pillowed under her head. Sam was still looking a little shifty around Cas and Dean rolled his eyes subtly. As much as he enjoyed teasing his brother about Cas it was honestly getting annoying to watch him pine over the guy all the time. He was pretty tempted to just give Cas a shake and point out the obvious but he knew that Sam wouldn't appreciate him messing about in his love life.

Besides, he had no idea how Cas felt about Sam and he didn't want to potentially ruin what the three of them had going by pointing it out so he was saying silent for now.

The librarian was introduced to them as Ava Wilson and Dean started to question her while Sam and Cas discussed some of the readings they'd gained quietly near the door.

"Miss Wilson, I'd just like to ask you some questions about what you saw this afternoon, could you tell me what happened?"

"I was returning some books that had been taken out to the shelves in the basement when I heard this noise like many pieces of paper being thrown into the air. I turned around and the reference cards were flying out the drawers on their own! There wasn't any kind of breeze to explain so I panicked and run away and I ran round a corner and I saw it!"

"It?"

"A Free Floating Full Torso Vaporous Apparition." Cas broke in.

"Er, yeah, what he said." Ava agreed slightly confused.

"Miss Wilson, have you or any member of your family been diagnosed with schizophrenia?"

"Are you saying I'm crazy?" She sat up and glared at Dean who put on his best placating smile and said "No, Miss Wilson, I'm just covering all bases, so have you?"

"No, not officially, but my uncle thought he was Saint Jerome."

Dean blinked in surprise and said "I think that qualifies. Do you regularly partake in substances with hallucinogenic properties?"

"I'm not a drug addict either!" She protested.

"Of course not. Just standard questions, Miss Wilson." He soothed. He was about to ask another when Cas squinted down at the piece of equipment in his hand and interrupted.

"Sam, Dean, its moving. Follow me." He quickly walked out of office with Sam on his heels. Dean sighed and picked up his jacket. It was going to be a long afternoon.


He followed Cas and Sam through a rabbit warren of book shelves taking turns at random, it seemed to Dean. He really hoped this didn't turn out to be a wild goose chase or he would be seriously pissed off. It didn't take him long to get bored and he started whistling 'The Twilight Zone' theme tune until Sam turned around and punched his arm.

"Ow! What the fuck!" He cursed and glared at Sam's bitchface.

"Quit fooling around Dean! This is serious." He hissed.

"Sam we've been walking around here for ten minutes and no sign of any ghosts!" Dean complained "It's probably just another wild goose chase."

"Sam, Dean come here." Cas called from a few aisles away. The two brothers turned a corner and saw Cas standing next to a neat stack of books in the centre of the aisle. Cas was scanning the book stack with the strange device he'd been using to track the supposed ghosts movement and looked at them, his ocean blue eyes were lit with excitement and said "Here is your sign, Dean."

"Oh yeah," he scoffed "because a human would never stack books like this."

"It's just like the Philadelphia mass disturbances in 1947! Symmetrical book stacking." Sam breathed out in awe and looked up and down the pile. Dean rolled his eyes.

"Hey, do you guys smell that?" Sam asked, sniffing the air like a bloodhound and slipping past the book stack without knocking it down. Following his nose, Sam lead them around a corner and they found the corridor which held the reference cards. Some of the drawers had been pulled out as far as they could go and the cards from them littered the floor. They were also covered in a thick gooey substance that looked a lot like something had sneezed over drawers.

"Ectoplasmic residue." Cas identified it as and pulled an empty petri dish from his trench coat and demanded "Dean, collect a sample."

"Oh no! I'm not touching that crap! Not a chance in hell."

"Dean, collect a sample!" Cas growled glaring at the other man. Cas might have been a small guy but he could still be damn intimidating when he wanted to.

"Fine," Dean relented "But you so owe me pie." He snatched the dish from Cas's outstretched hand and scraped the goo off of a nearby draw. Sam and Cas continued on the trail wondering further between the shelves leaving Dean to it.

"Aw man, this is damn skivvy." He complained as part of it oozed onto his hand when he shut the lid.

As soon as he caught up with Sam and Cas he wiped his hand on Sam back without him noticing and said "Here's your damn snot, Cas. What do you want it for anyway?"

"I wish to analyse it later." He murmured slipping it back into his coat and then saying "Be quite, we are close."

They continued stalking through the book shelves and eventually the handheld device, of which the explanation had almost caused DEan to fall asleep standing up, started to make an obnoxiously high pitched beeping sound.

They turned a corner and gasped collectively.

"Son of a bitch." Dean murmured "It's an actual ghost!"