Before Sam and Dean knew what was happening, they were standing in a dark and wet alley.

"Damn it Cass," Dean growled. "You couldn't even let me finish my goddamn sandwich?"

"I'm sorry​ Dean, but this is more important." Cass stated.

Sam and Dean whirled around to face Cass who was standing behind them. However to their surprise, Cass was not standing alone.

Standing behind Cass, hidden from the light, stood a figure. The figure resembled a girl, she was short, probably a teenager. Dean watched as the figure seemed to grow wings from her back.

"Cass?" Sam said, unsure of the hidden angel.

Cass simply turned to his side in order to see them all.

"Dean?" The girl spoke. Her voice was soft, almost child-like. Dean's guard was put up at the sound of his own name. He shifted his weight, planting his feet firmly on the ground. Prepared for what could emerge from the shadows.

The figure stepped into the light and her wings faded away. She was short, approximately 5'2". She had dirty blonde hair that flowed over her shoulders and hazel green eyes. She wore a black leather jacket and a white tank top with jeans and combat boots.

"Sam?" She asked again. She took a step toward the brothers.

Dean took a step back. He was still unsure of who she was, but something pulled at his chest telling him that he knew her.

"Dean it's me." She said sympathetically​. "Don't you remember? It's me. It's Kate."

There was a long pause. "I'm your sister." She choked.

Dean was not expecting that. He had never seen the girl in his life. Why was she claiming to be his sister? Dean turned to Sam who wore the same expression on his face. Sam was just as confused as Dean.

"They don't remember you Kate." Cass pointed out.

The alley was dark, but Dean could have sworn that he saw tears well up in the girl's eyes. Cass approached the brothers and firmly pressed his index and middle fingers against their heads.

"This should help." he said.

Sam and Dean felt as if they had hit by a semi truck as the memories came flooding back to them.