Mrs. Doolin is one of the most minor characters that debuts in "Who Killed Who".
History[]
Mrs. Doolin explains to Mandy, that Grim only spread rumors about her because she defeated him in everything. She reveals she actually won Grim's Old pet Lucky in a Bet.
After successfully scaring Billy, Mandy tells Mrs. Doolin they won but gets no response. When Mandy sees the house was abandoned and Doolin has disappeared, she recalls that Ms. Doolin told her that she beat Grim in everything and recalls Grim's words. She then realized that Ms. Doolin is actually an immortal Ghost who won against Death itself. Mandy promptly left the house.