Katherine: Boys, I need your help.
Sam: Katherine?! Since when you’re back? I thought you were gone or dead or…
Dean: What are you doing here? What do you want?
Katherine: I missed you so much. That’s why I’m here. I wanted to see your pretty little faces once again.
Dean: Just answer the question.
Katherine: Oh so grumpy. Okay fine. I need your help to kill a vampire.
Dean: I was about to say “always in when it’s about killing a vampire” but help you? I’ll pass, thank you.
Katherine: It’s Klaus. The original vampire. I need you to find a way to kill him. And, of course, I know where he is.