Agnes DelRooney is a recurring villain of The TV show, Duckman.
In "Aged Heat", Agnes was robbing a jewelry shop in the mall. When the cops showed up, she ran into the parking lot and found Grandma-ma in a car who looks like her. When Duckman and his family came back to the car, Agnes switches places with the Grandma-ma. After a few days, Duckman suspects that Grandma-ma isn't quite herself, of course no one believes him. Then Agnes reveals herself and holds the family hostage.