Dean began walking home with Cas, who was excited to meet Thunderstruck. Sam had said it was okay to bring him to the bunker.

When they arrived, Thunderstruck was waiting at the bottom of the stairs. Cas's reaction wasn't exactly what Dean had expected.

Castiel's face turned white. His eyes grew wide in shock and fear.

"What is that thing?" He exclaimed.

"My dog, Thunderstruck," Dean replied.

"That's not a dog. That's a Hellhound. I've read about them. Why hasn't it killed you?"

"Why would he kill me?"

"Because he's from Hell."

"So, you know. That you're an angel."

"Are you flirting with me right now? We're in danger! Now is not the time to express your obvious feelings for me."

"It's that obvious? Anyway, I'm not flirting. Sammy says that you're an actual angel. From heaven. Don't you remember?"

Just then, Castiel fell over, clutching his forehead. Dean rushed to his side. After a few seconds, Castiel got up.

"I remember. I remember my brothers and sisters. I remember what Axelia Annistyn did to me. She wiped my memory and kept me as her adopted child rather than killing me."

"Why would she want to kill you?"

"Because," he said, "I'm the reason her kingdom fell."