 The character of Joan Borman Kane was played by Christina Crawford  from 1968 to 1969. She was the adopted daughter of movie legend Joan  Crawford. During her run on the show Christina suffered an ovarian  tumor that required to be removed causing her to be absent from the  show for a several week period. Her mother Joan Crawford step in to  the the role despite that fact that she was in her sixties and the  Joan Kane character was in her twenties. Christina was apparently  upset about this for Joans appearance on the show turned out to be  a disaster causing the producers to eventually write the Joan  Boarman Kane character out of the series.