Sam and Dean were up late into the night. Sam was doing his usual scan of the news and internet to see if there would be something that would catch his attention. Dean was making his routinized rounds around his father's journal. He had bobby's notes and documentations right next to the journal.
Sam had a lot on his mind but he just didn't really know how to say it. He huffed and leaned back in his chair in frustration. He said,"Dean, we don't belong here..."
Dean scoffed with a sour tone,"It ain't like we got a choice, Sammy."
Sam made a huff and said,"Yea, but it isn't like they can keep us here either, Dean. It's illegal."
Dean said,"That didn't stop em' from kidnapping us."
Sam stared at his screen with disdain and exhaled exasperatedly through his nose. He said as he suddenly thought of it,"Bruce asked me to gather all the information we could on demons, even how to kill them and/ or dispel them."
Dean said with a sly smirk,"You're on first name basis?"
Sam made a face that made his eyes squint,"Shut up, Dean."
A voice from behind them muttered,"Hello, Dean."
Dean cursed and nearly jumped out of his skin. He yelled with annoyance," Goddammit Cas!"
Cas said in his low voice,"You seem more perturbed than usual..."
"You're damned right I'm perturbed-", He mocked Castiel's tone. "Where the hell have you been?!", He damanded.
Cas frowned at him and narrowed his eyes,"I wasn't in hell...I was in heaven..."
Dean pinched the bridge of his nose and sighed dramatically,"It's an expression."
Sam asked,"What have you been doing this whole time?"
Cas said,"I do have other duties than to hold your hands all the time."
Sam was taken back by Cas' snipped tone. Cas said with his brows furrowed deeply,"Why are you here, at Avengers tower?"
Dean muttered with an attitude,"We were forced here by a pirate who part times as a director of a super secret organization."
Castiel made a confused face. Sam cleared it up,"Nick Fury kidnapped us and dropped us here to teach the avengers how to fight...The supernatural."
Castiel asked,"Well?"
Dean said,"It isn't a walk in the park if that's what you're wondering."
Cas started walking toward the door," Let me talk to them..."
Sam reached for him and said,"No!"
By that time Cas had de-materialized. Sam and Dean darted down the hall and looked around. They didn't have to look for long because there was a "HOLY FUCK!" that came from the lab.
Dean and Sam rushed in that direction. When they entered the lab, Tony had surprised eyes and his iron man glove on. Bruce was clutching his chest and heaving, his eyes and face were green.
Sam side stepped in front of Cas. Sam said,"This is Castiel!He's with us!"
Dean looked at Bruce an asked with concern,"Hey you okay,Doc? You're a little green around the gills there."
Everyone turned to look at him. Bruce clenched his teeth and closed his eyes. He took a long breath and exhaled. He opened his eyes slowly and said,"I'm fine."
Dean looked at Cas with irritation,"We've talked about this Cas! Godammit, if you do that, you'll give someone a heart attack."
Tony stared with disapproval,"Who the hell is this and what is he doing in my tower?"
Sam explained,"He's a friend of ours. His name is Castiel-"
Bruce asked just as he caught his breath,"The angel?" He looked at the ordinary looking individual.
Castiel nodded. Tony frowned,"Seriously? You expect me to believe this guy is an angel..." He looked at Bruce, who was still gathering his bearings,"You don't believe this do you?"
Bruce took a breath,"It doesn't matter what I believe. It's all in the facts, if he says he's an angel...We have no cause or even evidence to confirm or deny this information."
One side of Tony's mouth went down as he looked at the individual in disbelief. Castiel said, "It has no matter, I am here to help."
Bruce pushed his glasses up onto his face,"Well why don't you tell us all you know about demons and demonic possession."
Meanwhile,
Crowley looked at his latest victim and smiled almost friendly like. He shrugged with a knife and blood on his hands,"You know what, I'll do you a favor. If you tell me what I want to know,-" he yelled the next part angrily,"I won't strangle you with your intestines and have you burn in the fiery pits of hell for all eternity!"
One of Crowley's cronies tapped him on the shoulder. he turned around to the demon with fury in his eyes,"What the bloody hell is so goddamned important that you are interrupting my interrogation?!"
Demon flinched as each word was spoken. He said,"I'm sorry sir...But the Winchesters are coming after you...again."
Crowley rubbed his face and demanded," Tell me something I don't know!"
The demon flinched again,"They have some help..."
Crowley asked,"Who?"
"The Avengers."
Crowley's face was calm. He said,"Well we can't have that can we?"
The man asked,"What are we going to do sir?"
Crowley tapped the bloody knife on his face. "Get someone to Avenges tower immediately."
It was nearly morning in New York. Sam and Dean had gone to bed hours ago and Tony had to get some sleep So he went to bed an hour ago. Castiel had disappeared, promising he'd be back by morning. Bruce was the only one left in the lab. Bruce read the journal that Sam gave him to look for some helpful information.
While Bruce did that, a black smoke traveled through the vents. It looked for someone to take hold of, little did Bruce know that he was the target. It seeped from the vent and down the wall like a disgusting liquid.
Bruce hadn't looked up from the book, let alone notice the black gas. Bruce walked over to the supply cabinet to grab another pen.
The black smoke practically slithered into his line of sight into the air. He gasped violently and backed away. He fell on the shelf in the cabinet, knocking over beakers and other glass instruments, cutting himself in the process.
The black gas attacked him, entering every orifice on his head. His eyes turned green but just as they did that, they turned black.
Sam and Dean were just waking up. Sam said,"I am so tired..."
Dean said,"Who are you telli-?"
A loud roar rung through the tower and the vibrations from the roar cut through them like a rusty knife.
Dean and Sam's eyes were wide with panic. Dean said with fright,"What the hell was that?"
