One day Sam, Dean, and Castiel were on their way to Elroy, Wisconsin to find out why everyone was left in sleep and never waking up. Once they arrived on the outskirts of the town Castiel told them to stop.
Once they did Castiel walks up and knelt down. On the ground in the middle of the road was a girl. She had bark brown hair, a necklace with an eighth note on it and was dressed in a baby blue dress.
When Castiel gently touched her shoulder the girl looked up and gasped and hugged Castiel. Even if you couldn't see them you could tell Castiel wrapped his wings around the girl and held her tightly in them and his arms.
Sam walks over and set his hand on Castiel's shoulder, "Do you know her?" he asked. Castiel smiled and replied, "Yes, she is Cassandra. An angel from heaven who has helped me save your brother from perdition."
Night came and Cassandra explained why she was in the town, "I was taken captive by Lucifer and he wanted me to sing the angels in heaven to sleep so he could take over heaven. and each time I said no he threated to break my wings. Eventually he kept that promise and he snapped them." Tears started to filled her eyes and Castiel held her tightly, " So how do you and Cas know each other?" Sam asked, " Well I and a warrior, angel of The Lord and an ex guardian angel, but Castiel and I met each other when we were assigned a mission to gather."
Dean looks at his brother and can tell immediately he was going to fall in love with this fallen angel. Dean elbows his brother in the arm hard enough for him to yelp. Sam scowls at his brother and Cassandra laughed.
A few days passed and they four were in Saint Paul Minnesota. They were looking for what seemed to be a werewolf. When they finally found it Castiel, Sam, and Dean were injured. Cassandra was the only one left to fight. She looks at Castiel being thrown across the warehouse they were in and rage hit her hard.
After the battle with the werewolf was finished Sam, Dean, and Castiel wouldn't awaken. Cassandra walked up to Castiel and touched his wound and it healed. Then Castiel gasped. She walks up to Sam and he was wounded up and down his arms. She healed these and just like Castiel he gasped for air.
Dean was worst of the three and Cassandra's powers were faulturing. Dean was up and down his arms, torso, and a gash was embedded on his head. She tapped her fingers to her lips and touched the gash on his head that began to heal. Then she tapped her torso then tapped his that began to heal and then she touched his arms and they healed. He like Sam and Castiel gasped for air and Cassandra fainted and Dean caught in his arms.
"Cas what's wrong with her?" Dean asked. Castiel shook his head knelt down and lifted her towards him, "She needs rest. When she healed us she used to much power."