Supernatural

your basically a new born angel who was accidentally sent to earth where you met Sam, Dean, and Castiel. Castiel basically took care of you since forever he's like a dad to you. anyway they were on a hunt with the rest of the group when they got jumped by demons and all got injured. now it's up to you to save them with an ancient spell. (your were always adorable and very innocent which is why they are shocked by how you just snapped and turned incredibly dangerous)