Emily Peterson - Marge Cotrooke

Marge Cotrooke first appeared in 1989 as Katherine Chancellor's look alike. She was also portrayed by Cooper from 1989 to 1990, before returning in 2008 and 2009.

History
In 1989, when Katherine Chancellor married Rex Sterling, a bum that spent some time in prison, his former cellmate Clint Radison, found Marge Cotrooke, a diner waitress and realized that she looked exactly like Katherine. He decided to use her in his plan to replace Kay with Marge and get to her fortune. His friends got jobs at the Chancellor mansion, while Marge was taught to act like Kay. Kay Chancellor and her housekeeper, Esther Valentine, were held captive while Marge replaced Kay. Marge immediately changed things from Katherine's life, starting with unintentionally pushing Rex into the arms of Jill Abbott. She also sold Chancellor Industries. When Kay's son, Brock Reynolds, returned from India, he realized that someone had replaced Kay. Marge later helped Kay catch Clint and his friends and get them in jail, before returning to her life as a waitress.

Marge returned to Kay's life in October 2008, asking her for help with her problems. Kay realized that Marge had become a drunk, and she wanted to help her beat the addiction as a payoff of Marge saving her life years ago. Kay never told anyone about Marge's problems and started showing signs of dementia, but she refused to give up on shipping Marge to a rehabilitation center. While at a local pub, Jeffrey Bardwell spotted Marge, drunk, and he thought she was Katherine. Kay finally decided to drive Marge to the center herself, but she ended up in a serious car crash. Marge died in the crash, but the general populace of Genoa City was convinced that Katherine Chancellor was dead.

Marge briefly returned as a ghost, aware that she was dead, but realized after seeing the people attending her funeral, specifically Esther, that they incorrectly believed she was Katherine. Deducing that Kay must still have been near the scene of the accident, she appeared near the crash site and discovered Kay's body lying motionless by the riverbank. She unsuccessfully attempted to awaken her friend. Her spirit soon dissipated. Patrick Murphy arrived and rescued Kay, believing she was Marge. He took care of her until it was revealed that she was really Katherine and had lost her memory.