Remember Krissy from last season's "Adventures in Babysitting?" Well, she's back. She's lost her dad and she's in full hunter mode. It's up to Sam and Dean to find a way to keep her safe. But, you know Krissy. She's tough. She's smart. And she thinks she's found a way to deal with her grief. Revenge.
While admittedly Season 7 wasn't what I'd call my favorite season of Supernatural, one of the highlights had to be the introduction of Krissy. Back then, the teenager turned to the Winchesters for help in rescuing her hunter father. At such a young age, she showed she was fierce, fiery and could handle herself with a knife.