Kaylee is the adopted daughter of John and Mary Winchester, who took her with her from her abusive father, who just left her all alone in a haunted house when John finds her during a hunt. After many years of growing up with her brothers and losing their mother in an awful fire. She decides to study at university with Sam while Dean continues to hunt. But then, one night, Dean shows up in the middle of the night asking his siblings for help finding their dad, who was missing. Since then, they have driven in Baby Dean's Car from State to State, solving cases of the supernatural unknown to some people until Kaylee finds out her real mother is alive.