Tags: Soap Character.
For the character’s great-granddaughter and namesake see Kathy Mershon.Katherine Kate Martin was a fictional character on the soap opera All My Children. She was known as Kate Martin. She was played by Christine Thomas for three weeks in January 1970 then by Kate Harrington for the from January to July 1970 and finally by Kay Campbell from August 1970 to April 1985.She was the matriarch of Martin family. Wife of Henry Martin and the mother of Joe Martin and Paul Martin.