A/N: This idea has been bouncing around my head for a while now so I hope you guys enjoy reading it. It'd set after season 11 of Supernatural so I wouldn't recommend reading if you haven't got to that point yet. This is my first Supernatural fic and my first attempt at a crossover, so bear with me if it's a little off.

Our Broken Souls

Sam woke with a groan. His head was pounding and the bullet wound in his leg was throbbing painfully, not to mention the discomfort on his wrists and chest that came with being bound to a chair. He groggily opened his eyes and squinted at his surroundings. He appeared to be in some sort of abandoned warehouse - why was it always warehouses? - and corridors stretched off into the distance. There was just one window which was so caked in dirt that only a little pale light managed to filter through.

Sam strained against his bonds but they were expertly tied. They weren't quite tight enough to cut off circulation, but enough to prevent any movement that would enable him to attempt escape. The rope was good and there were no signs of fraying that Sam could detect. These so-called British Men of Letters knew what they were doing. Suddenly the clack of heels filled the room and Sam jerked his head up to locate the source of the noise. A woman in her early 30s was stalking towards him. Lady Toni Bevell, Sam remembered she was called. Her long blonde hair was tied back into a ponytail and she was carrying a file - his no doubt.

"Sam. How nice to see you awake. Where's Dean?"

"Dead."

"So you say. However, I have every reason to believe you're lying to protect your wayward brother and none to trust you. And, if you hadn't noticed, you're the one currently tied up. So I suggest you co-operate."

"Go to Hell."

Toni ignored him and continued speaking. "We've been watching you and your brother for a long time now Sam. We know what you've done, the people who have died because of you. Believe me, if I'd had my way, that bullet would have gone through your head rather than your leg. However, my supervisors think that you could be of some use to us after all. They want you alive, although in what condition they didn't specify. If you won't tell us what we want to know, we have ways of making you talk. By the time we're done - and that won't be for a long time, I assure you - we will know everything we need and you will have been moved to a more... permanent location."

"So you claim to know everything about Dean and I. Then you'll know that, to save the world from Amara, Dean was turned into a walking, talking soul bomb and was blown apart from the inside."

Sam had the satisfaction of seeing Toni's confident mask slip for a second before she narrowed her eyes at him. "You're lying."

Sam sighed. "Look, lady, believe what you want. I don't have anything to tell you." He took another glance round the room "You said you and your friends have been keeping out of the way. This where you've been hiding out?"

Toni laughed mirthlessly. "Here? No. This is just for today. Tomorrow we'll be moving somewhere much further away where your little friends can't get at you."

"What makes you think anyone's coming for me? Cas is gone, and he can't track me anyway. Dean's dead. Anyone else who cared enough about me to come looking got killed."

Toni smirked a little. "We'll see about that." Abruptly, she turned and started walking away, her shoes echoing on the dusty concrete. "Until tomorrow, Sam," she called back.

Sam's shoulders slumped and he leant back into his chair, alone once more.

Merlin blinked. He was stood by a lake surrounded by a forest. Somewhere in the middle of the lake there was a small island, upon which there stood a tall obelisk. He instantly recognised this place as Avalon, as it had been in the days before Arthur's death and the long years he had spent alone.

"Hello? Arthur?" He called out. There was no reply but for the wind whispering through the trees and long grass. Merlin looked around desperately, searching for something, someone to explain why he was here. The hope that it might finally be time quickly faded, replaced by despair and hopelessness. He sank to his knees in the grass and put his head in his hands, at last allowing a sob to escape him. He'd been foolish enough to dare to believe his waiting was over... Look where that had got him.

"Merlin?" A woman's voice came from behind him, right by the water's edge. Merlin spun around and stared at the figure opposite him. She was as beautiful as the first time he set eyes on her with her dark hair cascading past her shoulders and the tattered red dress she'd been wearing all those years ago. She had a small smile on her face and Merlin's eyes welled up with tears as all the memories he'd tried so hard to bury came rushing back.

"Freya?" He managed to choke out. She nodded and he made to rush towards her, but she held out a hand to stop him.

"This isn't my physical form, Merlin," she explained. "You won't be able to touch me as the Veil still separates us. We must talk quickly. The time for action is almost upon us. Things have been stirring in Avalon, some good but some terrible, far worse than last time."

Merlin shuddered involuntarily. What could be worse than the havoc Morgana had wreaked in Camelot?

"I don't know what waits ahead," Freya explained. "But I do know that it must be dealt with, and swiftly. If we don't defeat it then the world will fall."

"How though? How am I supposed to defeat something when I don't even know what it is?"

"You will have help. Arthur will be returned and there will be others too. You will meet them soon enough. Return here at sunset in exactly one week. They'll be here."

"Thank you Freya. I'll be here," Merlin promised. She smiled at him again then her form flickered and faded away, leaving Merlin alone with only the gentle lapping of the water to comfort him.

A/N: I hope that was an okay first chapter. I'm going to try and update as often as I can and hopefully this story will be finished by the time Season 12 premieres. No promises though. School will be keeping me pretty busy this year. Please review! Bye!